25212421420 has 48 divisors (see below), whose sum is σ = 53338461120. Its totient is φ = 10010422016.

The previous prime is 25212421411. The next prime is 25212421457. The reversal of 25212421420 is 2412421252.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2253801 + ... + 2264959.

It is an arithmetic number, because the mean of its divisors is an integer number (1111217940).

Almost surely, 2^25212421420 is an apocalyptic number.

25212421420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25212421420 is an abundant number, since it is smaller than the sum of its proper divisors (28126039700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25212421420 is a wasteful number, since it uses less digits than its factorization.

25212421420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11994 (or 11992 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 25212421420 its reverse (2412421252), we get a palindrome (27624842672).

The spelling of 25212421420 in words is "twenty-five billion, two hundred twelve million, four hundred twenty-one thousand, four hundred twenty".