25989600021 has 16 divisors (see below), whose sum is σ = 43203491328. Its totient is φ = 13501090800.

The previous prime is 25989600019. The next prime is 25989600031. The reversal of 25989600021 is 12000698952.

It is not a de Polignac number, because 25989600021 - 2¹ = 25989600019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25989600031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56254315 + ... + 56254776.

It is an arithmetic number, because the mean of its divisors is an integer number (2700218208).

Almost surely, 2^25989600021 is an apocalyptic number.

25989600021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25989600021 is a deficient number, since it is larger than the sum of its proper divisors (17213891307).

25989600021 is a wasteful number, since it uses less digits than its factorization.

25989600021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112509112.

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 25989600021 in words is "twenty-five billion, nine hundred eighty-nine million, six hundred thousand, twenty-one".