21120445425 has 24 divisors (see below), whose sum is σ = 34930130400. Its totient is φ = 11260691200.

The previous prime is 21120445417. The next prime is 21120445427. The reversal of 21120445425 is 52454402112.

It is not a de Polignac number, because 21120445425 - 2³ = 21120445417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120445392 and 21120445401.

It is not an unprimeable number, because it can be changed into a prime (21120445427) 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 23 ways as a sum of consecutive naturals, for example, 204745 + ... + 290105.

It is an arithmetic number, because the mean of its divisors is an integer number (1455422100).

Almost surely, 2^21120445425 is an apocalyptic number.

21120445425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21120445425 is a deficient number, since it is larger than the sum of its proper divisors (13809684975).

21120445425 is a wasteful number, since it uses less digits than its factorization.

21120445425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88673 (or 88668 counting only the distinct ones).

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

Adding to 21120445425 its reverse (52454402112), we get a palindrome (73574847537).

The spelling of 21120445425 in words is "twenty-one billion, one hundred twenty million, four hundred forty-five thousand, four hundred twenty-five".