21000012012222 has 32 divisors (see below), whose sum is σ = 42052409057952. Its totient is φ = 6991278612864.

The previous prime is 21000012012193. The next prime is 21000012012271. The reversal of 21000012012222 is 22221021000012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14776408 + ... + 16135124.

It is an arithmetic number, because the mean of its divisors is an integer number (1314137783061).

Almost surely, 2^{21000012012222} is an apocalyptic number.

21000012012222 is an abundant number, since it is smaller than the sum of its proper divisors (21052397045730).

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

21000012012222 is a wasteful number, since it uses less digits than its factorization.

21000012012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361932.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21000012012222 its reverse (22221021000012), we get a palindrome (43221033012234).

The spelling of 21000012012222 in words is "twenty-one trillion, twelve million, twelve thousand, two hundred twenty-two".