21642650265 has 32 divisors (see below), whose sum is σ = 35832585600. Its totient is φ = 11141527040.

The previous prime is 21642650261. The next prime is 21642650269. The reversal of 21642650265 is 56205624612.

It is an interprime number because it is at equal distance from previous prime (21642650261) and next prime (21642650269).

It is not a de Polignac number, because 21642650265 - 2² = 21642650261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21642650261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2644630 + ... + 2652800.

It is an arithmetic number, because the mean of its divisors is an integer number (1119768300).

Almost surely, 2^21642650265 is an apocalyptic number.

It is an amenable number.

21642650265 is a deficient number, since it is larger than the sum of its proper divisors (14189935335).

21642650265 is a wasteful number, since it uses less digits than its factorization.

21642650265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14297.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 21642650265 in words is "twenty-one billion, six hundred forty-two million, six hundred fifty thousand, two hundred sixty-five".