21012033212 has 24 divisors (see below), whose sum is σ = 37328879616. Its totient is φ = 10346714928.

The previous prime is 21012033209. The next prime is 21012033247. The reversal of 21012033212 is 21233021012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1639943 + ... + 1652705.

It is an arithmetic number, because the mean of its divisors is an integer number (1555369984).

Almost surely, 2^21012033212 is an apocalyptic number.

It is an amenable number.

21012033212 is a deficient number, since it is larger than the sum of its proper divisors (16316846404).

21012033212 is a wasteful number, since it uses less digits than its factorization.

21012033212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18977 (or 18975 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21012033212 its reverse (21233021012), we get a palindrome (42245054224).

The spelling of 21012033212 in words is "twenty-one billion, twelve million, thirty-three thousand, two hundred twelve".