21213610641612 has 36 divisors (see below), whose sum is σ = 55472372657520. Its totient is φ = 6827368941792.

The previous prime is 21213610641581. The next prime is 21213610641631. The reversal of 21213610641612 is 21614601631212.

21213610641612 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 6 + 1 + 0 + 641 + 6 + 1 + 2 = 666.

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

It is a super-4 number, since 4×21213610641612⁴ (a number of 54 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10159774168 + ... + 10159776255.

Almost surely, 2^{21213610641612} is an apocalyptic number.

It is an amenable number.

21213610641612 is an abundant number, since it is smaller than the sum of its proper divisors (34258762015908).

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

21213610641612 is a wasteful number, since it uses less digits than its factorization.

21213610641612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20319550462 (or 20319550457 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21213610641612 in words is "twenty-one trillion, two hundred thirteen billion, six hundred ten million, six hundred forty-one thousand, six hundred twelve".