21214036536625 has 8 divisors (see below), whose sum is σ = 26475117597864. Its totient is φ = 16971229229200.

The previous prime is 21214036536617. The next prime is 21214036536677. The reversal of 21214036536625 is 52663563041212.

It can be written as a sum of positive squares in 4 ways, for example, as 203758348816 + 21010278187809 = 451396^2 + 4583697^2 .

It is not a de Polignac number, because 21214036536625 - 2³ = 21214036536617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84856146022 + ... + 84856146271.

It is an arithmetic number, because the mean of its divisors is an integer number (3309389699733).

Almost surely, 2^{21214036536625} is an apocalyptic number.

21214036536625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21214036536625 is a deficient number, since it is larger than the sum of its proper divisors (5261081061239).

21214036536625 is an equidigital number, since it uses as much as digits as its factorization.

21214036536625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169712292308 (or 169712292298 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 46.

Adding to 21214036536625 its reverse (52663563041212), we get a palindrome (73877599577837).

The spelling of 21214036536625 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, six hundred twenty-five".