21502651135 has 16 divisors (see below), whose sum is σ = 30091176000. Its totient is φ = 14744673888.

The previous prime is 21502651129. The next prime is 21502651151. The reversal of 21502651135 is 53115620512.

It is not a de Polignac number, because 21502651135 - 2⁷ = 21502651007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21502651097 and 21502651106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6267280 + ... + 6270709.

It is an arithmetic number, because the mean of its divisors is an integer number (1880698500).

Almost surely, 2^21502651135 is an apocalyptic number.

21502651135 is a deficient number, since it is larger than the sum of its proper divisors (8588524865).

21502651135 is an equidigital number, since it uses as much as digits as its factorization.

21502651135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12538015 (or 12538001 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 21502651135 in words is "twenty-one billion, five hundred two million, six hundred fifty-one thousand, one hundred thirty-five".