21210222211212 has 24 divisors (see below), whose sum is σ = 49491442413616. Its totient is φ = 7069942081728.

The previous prime is 21210222211193. The next prime is 21210222211271. The reversal of 21210222211212 is 21211222201212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15827923 + ... + 17115594.

Almost surely, 2^{21210222211212} is an apocalyptic number.

It is an amenable number.

21210222211212 is an abundant number, since it is smaller than the sum of its proper divisors (28281220202404).

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

21210222211212 is a wasteful number, since it uses less digits than its factorization.

21210222211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32997177 (or 32997175 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21210222211212 its reverse (21211222201212), we get a palindrome (42421444412424).

The spelling of 21210222211212 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twelve".