21726700732525 has 24 divisors (see below), whose sum is σ = 27087472529640. Its totient is φ = 17286977495040.

The previous prime is 21726700732523. The next prime is 21726700732531. The reversal of 21726700732525 is 52523700762712.

It can be written as a sum of positive squares in 12 ways, for example, as 11060134159684 + 10666566572841 = 3325678^2 + 3265971^2 .

It is not a de Polignac number, because 21726700732525 - 2¹ = 21726700732523 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726700732523) 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 23 ways as a sum of consecutive naturals, for example, 18801681 + ... + 19923769.

It is an arithmetic number, because the mean of its divisors is an integer number (1128644688735).

Almost surely, 2^{21726700732525} is an apocalyptic number.

21726700732525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21726700732525 is a deficient number, since it is larger than the sum of its proper divisors (5360771797115).

21726700732525 is a wasteful number, since it uses less digits than its factorization.

21726700732525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126305 (or 1126300 counting only the distinct ones).

The product of its (nonzero) digits is 2469600, while the sum is 49.

The spelling of 21726700732525 in words is "twenty-one trillion, seven hundred twenty-six billion, seven hundred million, seven hundred thirty-two thousand, five hundred twenty-five".