25142544021 has 32 divisors (see below), whose sum is σ = 39262003200. Its totient is φ = 14011355520.

The previous prime is 25142543999. The next prime is 25142544041. The reversal of 25142544021 is 12044524152.

It is not a de Polignac number, because 25142544021 - 2⁹ = 25142543509 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25142544021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25142544041) 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 31 ways as a sum of consecutive naturals, for example, 3508440 + ... + 3515598.

It is an arithmetic number, because the mean of its divisors is an integer number (1226937600).

Almost surely, 2^25142544021 is an apocalyptic number.

25142544021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25142544021 is a deficient number, since it is larger than the sum of its proper divisors (14119459179).

25142544021 is a wasteful number, since it uses less digits than its factorization.

25142544021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11289.

The product of its (nonzero) digits is 12800, while the sum is 30.

The spelling of 25142544021 in words is "twenty-five billion, one hundred forty-two million, five hundred forty-four thousand, twenty-one".