21021112102212 has 36 divisors (see below), whose sum is σ = 53137768867456. Its totient is φ = 7006896422640.

The previous prime is 21021112102201. The next prime is 21021112102213. The reversal of 21021112102212 is 21220121112012.

21021112102212 is a `hidden beast` number, since 21 + 0 + 211 + 1 + 210 + 221 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (21021112102213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4050364 + ... + 7645107.

Almost surely, 2^{21021112102212} is an apocalyptic number.

It is an amenable number.

21021112102212 is an abundant number, since it is smaller than the sum of its proper divisors (32116656765244).

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

21021112102212 is a wasteful number, since it uses less digits than its factorization.

21021112102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11745408 (or 11745403 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21021112102212 its reverse (21220121112012), we get a palindrome (42241233214224).

The spelling of 21021112102212 in words is "twenty-one trillion, twenty-one billion, one hundred twelve million, one hundred two thousand, two hundred twelve".