21304511521115 has 8 divisors (see below), whose sum is σ = 26159958333168. Its totient is φ = 16647246211680.

The previous prime is 21304511521087. The next prime is 21304511521157. The reversal of 21304511521115 is 51112511540312.

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

It is not a de Polignac number, because 21304511521115 - 2²² = 21304507326811 is a prime.

It is a super-2 number, since 2×21304511521115² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49545375416 + ... + 49545375845.

It is an arithmetic number, because the mean of its divisors is an integer number (3269994791646).

Almost surely, 2^{21304511521115} is an apocalyptic number.

21304511521115 is a deficient number, since it is larger than the sum of its proper divisors (4855446812053).

21304511521115 is an equidigital number, since it uses as much as digits as its factorization.

21304511521115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99090751309.

The product of its (nonzero) digits is 6000, while the sum is 32.

The spelling of 21304511521115 in words is "twenty-one trillion, three hundred four billion, five hundred eleven million, five hundred twenty-one thousand, one hundred fifteen".