21603214160725 has 12 divisors (see below), whose sum is σ = 26853481869220. Its totient is φ = 17240315644800.

The previous prime is 21603214160713. The next prime is 21603214160767. The reversal of 21603214160725 is 52706141230612.

It can be written as a sum of positive squares in 6 ways, for example, as 19022478084 + 21584191682641 = 137922^2 + 4645879^2 .

It is not a de Polignac number, because 21603214160725 - 2⁷ = 21603214160597 is a prime.

It is a super-2 number, since 2×21603214160725² (a number of 27 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 11 ways as a sum of consecutive naturals, for example, 1056381666 + ... + 1056402115.

Almost surely, 2^{21603214160725} is an apocalyptic number.

21603214160725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21603214160725 is a deficient number, since it is larger than the sum of its proper divisors (5250267708495).

21603214160725 is a wasteful number, since it uses less digits than its factorization.

21603214160725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112784200 (or 2112784195 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21603214160725 in words is "twenty-one trillion, six hundred three billion, two hundred fourteen million, one hundred sixty thousand, seven hundred twenty-five".