21120304425 has 48 divisors (see below), whose sum is σ = 38470662720. Its totient is φ = 10138720000.

The previous prime is 21120304421. The next prime is 21120304427. The reversal of 21120304425 is 52440302112.

It is not a de Polignac number, because 21120304425 - 2² = 21120304421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120304395 and 21120304404.

It is not an unprimeable number, because it can be changed into a prime (21120304421) 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, 43410 + ... + 210059.

It is an arithmetic number, because the mean of its divisors is an integer number (801472140).

Almost surely, 2^21120304425 is an apocalyptic number.

21120304425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21120304425 is a deficient number, since it is larger than the sum of its proper divisors (17350358295).

21120304425 is a wasteful number, since it uses less digits than its factorization.

21120304425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253594 (or 253589 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21120304425 its reverse (52440302112), we get a palindrome (73560606537).

The spelling of 21120304425 in words is "twenty-one billion, one hundred twenty million, three hundred four thousand, four hundred twenty-five".