21025635365 has 16 divisors (see below), whose sum is σ = 28846583040. Its totient is φ = 14411865600.

The previous prime is 21025635289. The next prime is 21025635383. The reversal of 21025635365 is 56353652012.

It is not a de Polignac number, because 21025635365 - 2⁸ = 21025635109 is a prime.

It is a Curzon number.

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, 28460 + ... + 207029.

It is an arithmetic number, because the mean of its divisors is an integer number (1802911440).

Almost surely, 2^21025635365 is an apocalyptic number.

It is an amenable number.

21025635365 is a deficient number, since it is larger than the sum of its proper divisors (7820947675).

21025635365 is a wasteful number, since it uses less digits than its factorization.

21025635365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238052.

The product of its (nonzero) digits is 162000, while the sum is 38.

The spelling of 21025635365 in words is "twenty-one billion, twenty-five million, six hundred thirty-five thousand, three hundred sixty-five".