21095465538 has 16 divisors (see below), whose sum is σ = 48218207040. Its totient is φ = 6027275856.

The previous prime is 21095465527. The next prime is 21095465579. The reversal of 21095465538 is 83556459012.

It is a Curzon number.

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, 251136453 + ... + 251136536.

It is an arithmetic number, because the mean of its divisors is an integer number (3013637940).

Almost surely, 2^21095465538 is an apocalyptic number.

21095465538 is an abundant number, since it is smaller than the sum of its proper divisors (27122741502).

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

21095465538 is a wasteful number, since it uses less digits than its factorization.

21095465538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502273001.

The product of its (nonzero) digits is 1296000, while the sum is 48.

The spelling of 21095465538 in words is "twenty-one billion, ninety-five million, four hundred sixty-five thousand, five hundred thirty-eight".