210121222212 has 72 divisors (see below), whose sum is σ = 579690139392. Its totient is φ = 63643982400.

The previous prime is 210121222189. The next prime is 210121222229. The reversal of 210121222212 is 212222121012.

It is a happy number.

210121222212 is a `hidden beast` number, since 210 + 1 + 21 + 222 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 753762 + ... + 994182.

It is an arithmetic number, because the mean of its divisors is an integer number (8051251936).

Almost surely, 2^210121222212 is an apocalyptic number.

210121222212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

210121222212 is an abundant number, since it is smaller than the sum of its proper divisors (369568917180).

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

210121222212 is a wasteful number, since it uses less digits than its factorization.

210121222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242649 (or 242644 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210121222212 its reverse (212222121012), we get a palindrome (422343343224).

The spelling of 210121222212 in words is "two hundred ten billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".