21356612510 has 16 divisors (see below), whose sum is σ = 40113290016. Its totient is φ = 8171225568.

The previous prime is 21356612507. The next prime is 21356612513. The reversal of 21356612510 is 1521665312.

It is an interprime number because it is at equal distance from previous prime (21356612507) and next prime (21356612513).

It is a super-2 number, since 2×21356612510² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356612513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46427189 + ... + 46427648.

It is an arithmetic number, because the mean of its divisors is an integer number (2507080626).

Almost surely, 2^21356612510 is an apocalyptic number.

21356612510 is a deficient number, since it is larger than the sum of its proper divisors (18756677506).

21356612510 is a wasteful number, since it uses less digits than its factorization.

21356612510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92854867.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 21356612510 in words is "twenty-one billion, three hundred fifty-six million, six hundred twelve thousand, five hundred ten".