21130397915 has 8 divisors (see below), whose sum is σ = 27661611888. Its totient is φ = 15367562080.

The previous prime is 21130397903. The next prime is 21130397927. The reversal of 21130397915 is 51979303112.

It is an interprime number because it is at equal distance from previous prime (21130397903) and next prime (21130397927).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21130397915 - 2²² = 21126203611 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 192094472 + ... + 192094581.

It is an arithmetic number, because the mean of its divisors is an integer number (3457701486).

Almost surely, 2^21130397915 is an apocalyptic number.

21130397915 is a deficient number, since it is larger than the sum of its proper divisors (6531213973).

21130397915 is a wasteful number, since it uses less digits than its factorization.

21130397915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384189069.

The product of its (nonzero) digits is 51030, while the sum is 41.

The spelling of 21130397915 in words is "twenty-one billion, one hundred thirty million, three hundred ninety-seven thousand, nine hundred fifteen".