21651594195 has 96 divisors (see below), whose sum is σ = 43853483520. Its totient is φ = 8928691200.

The previous prime is 21651594163. The next prime is 21651594269. The reversal of 21651594195 is 59149515612.

It is not a de Polignac number, because 21651594195 - 2⁵ = 21651594163 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1657851 + ... + 1670859.

It is an arithmetic number, because the mean of its divisors is an integer number (456807120).

Almost surely, 2^21651594195 is an apocalyptic number.

21651594195 is an abundant number, since it is smaller than the sum of its proper divisors (22201889325).

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

21651594195 is a wasteful number, since it uses less digits than its factorization.

21651594195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13177 (or 13166 counting only the distinct ones).

The product of its digits is 486000, while the sum is 48.

The spelling of 21651594195 in words is "twenty-one billion, six hundred fifty-one million, five hundred ninety-four thousand, one hundred ninety-five".