21536360140 has 24 divisors (see below), whose sum is σ = 45250530192. Its totient is φ = 8609939520.

The previous prime is 21536360123. The next prime is 21536360149. The reversal of 21536360140 is 4106363512.

It is not an unprimeable number, because it can be changed into a prime (21536360149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249306 + ... + 324385.

It is an arithmetic number, because the mean of its divisors is an integer number (1885438758).

Almost surely, 2^21536360140 is an apocalyptic number.

21536360140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21536360140 is an abundant number, since it is smaller than the sum of its proper divisors (23714170052).

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

21536360140 is a wasteful number, since it uses less digits than its factorization.

21536360140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575577 (or 575575 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 21536360140 in words is "twenty-one billion, five hundred thirty-six million, three hundred sixty thousand, one hundred forty".