21423165610 has 32 divisors (see below), whose sum is σ = 48076924032. Its totient is φ = 6677350080.

The previous prime is 21423165601. The next prime is 21423165613. The reversal of 21423165610 is 1656132412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21423165613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13910377 + ... + 13911916.

It is an arithmetic number, because the mean of its divisors is an integer number (1502403876).

Almost surely, 2^21423165610 is an apocalyptic number.

21423165610 is an abundant number, since it is smaller than the sum of its proper divisors (26653758422).

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

21423165610 is a wasteful number, since it uses less digits than its factorization.

21423165610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27822318.

The product of its (nonzero) digits is 8640, while the sum is 31.

It can be divided in two parts, 214231 and 65610, that added together give a 4-th power (279841 = 23⁴).

The spelling of 21423165610 in words is "twenty-one billion, four hundred twenty-three million, one hundred sixty-five thousand, six hundred ten".