21021022112212 has 24 divisors (see below), whose sum is σ = 37057769290080. Its totient is φ = 10433113856160.

The previous prime is 21021022112201. The next prime is 21021022112219. The reversal of 21021022112212 is 21221122012012.

It is a self number, because there is not a number n which added to its sum of digits gives 21021022112212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021022112219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33363 + ... + 6484069.

It is an arithmetic number, because the mean of its divisors is an integer number (1544073720420).

Almost surely, 2^{21021022112212} is an apocalyptic number.

It is an amenable number.

21021022112212 is a deficient number, since it is larger than the sum of its proper divisors (16036747177868).

21021022112212 is a wasteful number, since it uses less digits than its factorization.

21021022112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6456711 (or 6456709 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021022112212 its reverse (21221122012012), we get a palindrome (42242144124224).

The spelling of 21021022112212 in words is "twenty-one trillion, twenty-one billion, twenty-two million, one hundred twelve thousand, two hundred twelve".