21620161854612 has 36 divisors (see below), whose sum is σ = 56675074493856. Its totient is φ = 7206720617880.

The previous prime is 21620161854587. The next prime is 21620161854653. The reversal of 21620161854612 is 21645816102612.

21620161854612 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 0 + 1 + 6 + 185 + 461 + 2 = 666.

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

It is a congruent number.

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, 11121481464 + ... + 11121483407.

Almost surely, 2^{21620161854612} is an apocalyptic number.

It is an amenable number.

21620161854612 is an abundant number, since it is smaller than the sum of its proper divisors (35054912639244).

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

21620161854612 is a wasteful number, since it uses less digits than its factorization.

21620161854612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22242964890 (or 22242964876 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 21620161854612 in words is "twenty-one trillion, six hundred twenty billion, one hundred sixty-one million, eight hundred fifty-four thousand, six hundred twelve".