25253320521 has 64 divisors (see below), whose sum is σ = 40317419520. Its totient is φ = 13857696000.

The previous prime is 25253320517. The next prime is 25253320579. The reversal of 25253320521 is 12502335252.

It is not a de Polignac number, because 25253320521 - 2² = 25253320517 is a prime.

It is a super-2 number, since 2×25253320521² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25253320501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11277720 + ... + 11279958.

It is an arithmetic number, because the mean of its divisors is an integer number (629959680).

Almost surely, 2^25253320521 is an apocalyptic number.

It is an amenable number.

25253320521 is a deficient number, since it is larger than the sum of its proper divisors (15064098999).

25253320521 is a wasteful number, since it uses less digits than its factorization.

25253320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 25253320521 its reverse (12502335252), we get a palindrome (37755655773).

The spelling of 25253320521 in words is "twenty-five billion, two hundred fifty-three million, three hundred twenty thousand, five hundred twenty-one".