21031120425 has 48 divisors (see below), whose sum is σ = 41830338560. Its totient is φ = 9108210240.

The previous prime is 21031120423. The next prime is 21031120433. The reversal of 21031120425 is 52402113012.

It is not a de Polignac number, because 21031120425 - 2¹ = 21031120423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21031120423) 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, 1044217 + ... + 1064166.

Almost surely, 2^21031120425 is an apocalyptic number.

21031120425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21031120425 is a deficient number, since it is larger than the sum of its proper divisors (20799218135).

21031120425 is a wasteful number, since it uses less digits than its factorization.

21031120425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108422 (or 2108417 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21031120425 its reverse (52402113012), we get a palindrome (73433233437).

The spelling of 21031120425 in words is "twenty-one billion, thirty-one million, one hundred twenty thousand, four hundred twenty-five".