21093525261 has 24 divisors (see below), whose sum is σ = 30644519360. Its totient is φ = 13981165056.

The previous prime is 21093525253. The next prime is 21093525263. The reversal of 21093525261 is 16252539012.

It is a happy number.

21093525261 is a `hidden beast` number, since 2 + 109 + 3 + 525 + 26 + 1 = 666.

It is not a de Polignac number, because 21093525261 - 2³ = 21093525253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21093525263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4616400 + ... + 4620966.

Almost surely, 2^21093525261 is an apocalyptic number.

It is an amenable number.

21093525261 is a deficient number, since it is larger than the sum of its proper divisors (9550994099).

21093525261 is a wasteful number, since it uses less digits than its factorization.

21093525261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7425 (or 7422 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

It can be divided in two parts, 210935 and 25261, that added together give a square (236196 = 486²).

The spelling of 21093525261 in words is "twenty-one billion, ninety-three million, five hundred twenty-five thousand, two hundred sixty-one".