21860268420 has 24 divisors (see below), whose sum is σ = 61208751744. Its totient is φ = 5829404896.

The previous prime is 21860268383. The next prime is 21860268427. The reversal of 21860268420 is 2486206812.

It is not an unprimeable number, because it can be changed into a prime (21860268427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182168844 + ... + 182168963.

It is an arithmetic number, because the mean of its divisors is an integer number (2550364656).

Almost surely, 2^21860268420 is an apocalyptic number.

21860268420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21860268420 is an abundant number, since it is smaller than the sum of its proper divisors (39348483324).

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

21860268420 is a wasteful number, since it uses less digits than its factorization.

21860268420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364337819 (or 364337817 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The spelling of 21860268420 in words is "twenty-one billion, eight hundred sixty million, two hundred sixty-eight thousand, four hundred twenty".