21013000123212 has 72 divisors (see below), whose sum is σ = 55178854104192. Its totient is φ = 6735212640000.

The previous prime is 21013000123201. The next prime is 21013000123259. The reversal of 21013000123212 is 21232100031012.

21013000123212 is a `hidden beast` number, since 210 + 130 + 0 + 0 + 1 + 2 + 321 + 2 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59789289 + ... + 60139712.

Almost surely, 2^{21013000123212} is an apocalyptic number.

It is an amenable number.

21013000123212 is an abundant number, since it is smaller than the sum of its proper divisors (34165853980980).

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

21013000123212 is a wasteful number, since it uses less digits than its factorization.

21013000123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119929199 (or 119929194 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21013000123212 its reverse (21232100031012), we get a palindrome (42245100154224).

The spelling of 21013000123212 in words is "twenty-one trillion, thirteen billion, one hundred twenty-three thousand, two hundred twelve".