21601630414525 has 24 divisors (see below), whose sum is σ = 30883504204224. Its totient is φ = 14681462073600.

The previous prime is 21601630414501. The next prime is 21601630414531. The reversal of 21601630414525 is 52541403610612.

It is not a de Polignac number, because 21601630414525 - 2¹⁹ = 21601629890237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 546165571 + ... + 546205120.

It is an arithmetic number, because the mean of its divisors is an integer number (1286812675176).

Almost surely, 2^{21601630414525} is an apocalyptic number.

21601630414525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21601630414525 is a deficient number, since it is larger than the sum of its proper divisors (9281873789699).

21601630414525 is a wasteful number, since it uses less digits than its factorization.

21601630414525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092370821 (or 1092370816 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 21601630414525 in words is "twenty-one trillion, six hundred one billion, six hundred thirty million, four hundred fourteen thousand, five hundred twenty-five".