21130315045 has 24 divisors (see below), whose sum is σ = 29189631744. Its totient is φ = 14384658528.

The previous prime is 21130315039. The next prime is 21130315051. The reversal of 21130315045 is 54051303112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21130315039) and next prime (21130315051).

It is not a de Polignac number, because 21130315045 - 2⁵ = 21130315013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 660612 + ... + 691858.

It is an arithmetic number, because the mean of its divisors is an integer number (1216234656).

Almost surely, 2^21130315045 is an apocalyptic number.

It is an amenable number.

21130315045 is a deficient number, since it is larger than the sum of its proper divisors (8059316699).

21130315045 is an equidigital number, since it uses as much as digits as its factorization.

21130315045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31537 (or 31398 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21130315045 its reverse (54051303112), we get a palindrome (75181618157).

The spelling of 21130315045 in words is "twenty-one billion, one hundred thirty million, three hundred fifteen thousand, forty-five".