25155020531421 has 48 divisors (see below), whose sum is σ = 40360356736128. Its totient is φ = 14968617321600.

The previous prime is 25155020531413. The next prime is 25155020531429. The reversal of 25155020531421 is 12413502055152.

25155020531421 is a `hidden beast` number, since 2 + 5 + 1 + 5 + 502 + 0 + 5 + 3 + 142 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (25155020531413) and next prime (25155020531429).

It is not a de Polignac number, because 25155020531421 - 2³ = 25155020531413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25155020531429) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 375441 + ... + 7102886.

It is an arithmetic number, because the mean of its divisors is an integer number (840840765336).

Almost surely, 2^{25155020531421} is an apocalyptic number.

It is an amenable number.

25155020531421 is a deficient number, since it is larger than the sum of its proper divisors (15205336204707).

25155020531421 is a wasteful number, since it uses less digits than its factorization.

25155020531421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7478962 (or 7478959 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

Adding to 25155020531421 its reverse (12413502055152), we get a palindrome (37568522586573).

The spelling of 25155020531421 in words is "twenty-five trillion, one hundred fifty-five billion, twenty million, five hundred thirty-one thousand, four hundred twenty-one".