1212211000 has 384 divisors, whose sum is σ = 3898964160. Its totient is φ = 346752000.

The previous prime is 1212210953. The next prime is 1212211009. The reversal of 1212211000 is 1122121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7006914 + ... + 7007086.

Almost surely, 2^1212211000 is an apocalyptic number.

1212211000 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 1212211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1949482080).

1212211000 is an abundant number, since it is smaller than the sum of its proper divisors (2686753160).

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

1212211000 is a wasteful number, since it uses less digits than its factorization.

1212211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1212211000 is about 34816.8206474974. The cubic root of 1212211000 is about 1066.2508904729.

Adding to 1212211000 its reverse (1122121), we get a palindrome (1213333121).

It can be divided in two parts, 121221 and 1000, that added together give a palindrome (122221).

The spelling of 1212211000 in words is "one billion, two hundred twelve million, two hundred eleven thousand".