21365506577156 has 96 divisors (see below), whose sum is σ = 46358158436352. Its totient is φ = 8417371311360.

The previous prime is 21365506577123. The next prime is 21365506577209. The reversal of 21365506577156 is 65177560556312.

It is a junction number, because it is equal to n+sod(n) for n = 21365506577095 and 21365506577104.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4269566 + ... + 7807701.

It is an arithmetic number, because the mean of its divisors is an integer number (482897483712).

Almost surely, 2^{21365506577156} is an apocalyptic number.

It is an amenable number.

21365506577156 is an abundant number, since it is smaller than the sum of its proper divisors (24992651859196).

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

21365506577156 is a wasteful number, since it uses less digits than its factorization.

21365506577156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12077409 (or 12077407 counting only the distinct ones).

The product of its (nonzero) digits is 39690000, while the sum is 59.

The spelling of 21365506577156 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred six million, five hundred seventy-seven thousand, one hundred fifty-six".