21553096825 has 24 divisors (see below), whose sum is σ = 30474721368. Its totient is φ = 14979886080.

The previous prime is 21553096813. The next prime is 21553096853. The reversal of 21553096825 is 52869035512.

It can be written as a sum of positive squares in 12 ways, for example, as 11020590441 + 10532506384 = 104979^2 + 102628^2 .

It is not a de Polignac number, because 21553096825 - 2²⁹ = 21016225913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1944982 + ... + 1956031.

It is an arithmetic number, because the mean of its divisors is an integer number (1269780057).

Almost surely, 2^21553096825 is an apocalyptic number.

21553096825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21553096825 is a deficient number, since it is larger than the sum of its proper divisors (8921624543).

21553096825 is a wasteful number, since it uses less digits than its factorization.

21553096825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3901053 (or 3901048 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 21553096825 in words is "twenty-one billion, five hundred fifty-three million, ninety-six thousand, eight hundred twenty-five".