1211210000 has 400 divisors, whose sum is σ = 3969829248. Its totient is φ = 348480000.

The previous prime is 1211209973. The next prime is 1211210009. The reversal of 1211210000 is 121121.

It is a tau number, because it is divible by the number of its divisors (400).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1211210000.

It is not an unprimeable number, because it can be changed into a prime (1211210009) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 93169994 + ... + 93170006.

Almost surely, 2^1211210000 is an apocalyptic number.

1211210000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1984914624).

1211210000 is an abundant number, since it is smaller than the sum of its proper divisors (2758619248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211210000 is an equidigital number, since it uses as much as digits as its factorization.

1211210000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1211210000 is about 34802.4424430240. The cubic root of 1211210000 is about 1065.9573191777.

Adding to 1211210000 its reverse (121121), we get a palindrome (1211331121).

Multiplying 1211210000 by its reverse (121121), we get a square (146702966410000 = 12112100²).

1211210000 divided by its reverse (121121) gives a 4-th power (10000 = 10⁴).

It can be divided in two parts, 121 and 1210000, that multiplied together give a 4-th power (146410000 = 110⁴).

The spelling of 1211210000 in words is "one billion, two hundred eleven million, two hundred ten thousand".