1212211211000 has 64 divisors (see below), whose sum is σ = 2840445766080. Its totient is φ = 484222684800.

The previous prime is 1212211210979. The next prime is 1212211211009. The reversal of 1212211211000 is 1121122121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211211009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93884 + ... + 1559883.

It is an arithmetic number, because the mean of its divisors is an integer number (44381965095).

Almost surely, 2^{1212211211000} is an apocalyptic number.

1212211211000 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 1212211211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1420222883040).

1212211211000 is an abundant number, since it is smaller than the sum of its proper divisors (1628234555080).

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

1212211211000 is a wasteful number, since it uses less digits than its factorization.

1212211211000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654521 (or 1654507 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212211211000 its reverse (1121122121), we get a palindrome (1213332333121).

It can be divided in two parts, 121221121 and 1000, that added together give a palindrome (121222121).

The spelling of 1212211211000 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred eleven thousand".