25152401421 has 64 divisors (see below), whose sum is σ = 43793510400. Its totient is φ = 13966302528.

The previous prime is 25152401413. The next prime is 25152401429. The reversal of 25152401421 is 12410425152.

It is a happy number.

25152401421 is a `hidden beast` number, since 2 + 515 + 2 + 4 + 0 + 142 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (25152401413) and next prime (25152401429).

It is not a de Polignac number, because 25152401421 - 2³ = 25152401413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25152401429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6872290 + ... + 6875948.

It is an arithmetic number, because the mean of its divisors is an integer number (684273600).

Almost surely, 2^25152401421 is an apocalyptic number.

25152401421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25152401421 is a deficient number, since it is larger than the sum of its proper divisors (18641108979).

25152401421 is a wasteful number, since it uses less digits than its factorization.

25152401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695 (or 4689 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 25152401421 its reverse (12410425152), we get a palindrome (37562826573).

The spelling of 25152401421 in words is "twenty-five billion, one hundred fifty-two million, four hundred one thousand, four hundred twenty-one".