21012112021212 has 48 divisors (see below), whose sum is σ = 58666295675680. Its totient is φ = 6465265236864.

The previous prime is 21012112021157. The next prime is 21012112021361. The reversal of 21012112021212 is 21212021121012.

21012112021212 is a `hidden beast` number, since 210 + 1 + 211 + 20 + 212 + 12 = 666.

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

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, 7482944473 + ... + 7482947280.

Almost surely, 2^{21012112021212} is an apocalyptic number.

It is an amenable number.

21012112021212 is an abundant number, since it is smaller than the sum of its proper divisors (37654183654468).

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

21012112021212 is a wasteful number, since it uses less digits than its factorization.

21012112021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14965891779 (or 14965891771 counting only the distinct ones).

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

Adding to 21012112021212 its reverse (21212021121012), we get a palindrome (42224133142224).

The spelling of 21012112021212 in words is "twenty-one trillion, twelve billion, one hundred twelve million, twenty-one thousand, two hundred twelve".