21004267212 has 72 divisors (see below), whose sum is σ = 55920096960. Its totient is φ = 6629182560.

The previous prime is 21004267201. The next prime is 21004267213. The reversal of 21004267212 is 21276240012.

21004267212 is a `hidden beast` number, since 21 + 0 + 0 + 426 + 7 + 212 = 666.

It is a super-2 number, since 2×21004267212² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21004267213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1362387 + ... + 1377717.

Almost surely, 2^21004267212 is an apocalyptic number.

It is an amenable number.

21004267212 is an abundant number, since it is smaller than the sum of its proper divisors (34915829748).

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

21004267212 is a wasteful number, since it uses less digits than its factorization.

21004267212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17363 (or 17358 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The spelling of 21004267212 in words is "twenty-one billion, four million, two hundred sixty-seven thousand, two hundred twelve".