21365564127020 has 24 divisors (see below), whose sum is σ = 46818453566304. Its totient is φ = 8174650622336.

The previous prime is 21365564126999. The next prime is 21365564127041. The reversal of 21365564127020 is 2072146556312.

It is an interprime number because it is at equal distance from previous prime (21365564126999) and next prime (21365564127041).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23223438809 + ... + 23223439728.

It is an arithmetic number, because the mean of its divisors is an integer number (1950768898596).

Almost surely, 2^{21365564127020} is an apocalyptic number.

21365564127020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21365564127020 is an abundant number, since it is smaller than the sum of its proper divisors (25452889439284).

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

21365564127020 is a wasteful number, since it uses less digits than its factorization.

21365564127020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46446878569 (or 46446878567 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 21365564127020 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixty-four million, one hundred twenty-seven thousand, twenty".