21330502365 has 16 divisors (see below), whose sum is σ = 34130613888. Its totient is φ = 11375664576.

The previous prime is 21330502357. The next prime is 21330502421. The reversal of 21330502365 is 56320503312.

It is not a de Polignac number, because 21330502365 - 2³ = 21330502357 is a prime.

It is a super-2 number, since 2×21330502365² (a number of 21 digits) contains 22 as substring.

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, 545199 + ... + 583011.

It is an arithmetic number, because the mean of its divisors is an integer number (2133163368).

Almost surely, 2^21330502365 is an apocalyptic number.

It is an amenable number.

21330502365 is a deficient number, since it is larger than the sum of its proper divisors (12800111523).

21330502365 is a wasteful number, since it uses less digits than its factorization.

21330502365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75428.

The product of its (nonzero) digits is 16200, while the sum is 30.

The spelling of 21330502365 in words is "twenty-one billion, three hundred thirty million, five hundred two thousand, three hundred sixty-five".