21306801415 has 8 divisors (see below), whose sum is σ = 25573302288. Its totient is φ = 17042014080.

The previous prime is 21306801391. The next prime is 21306801449. The reversal of 21306801415 is 51410860312.

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

It is not a de Polignac number, because 21306801415 - 2²⁷ = 21172583687 is a prime.

It is a Duffinian number.

It is a congruent 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, 400866 + ... + 450895.

It is an arithmetic number, because the mean of its divisors is an integer number (3196662786).

Almost surely, 2^21306801415 is an apocalyptic number.

21306801415 is a deficient number, since it is larger than the sum of its proper divisors (4266500873).

21306801415 is an equidigital number, since it uses as much as digits as its factorization.

21306801415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856769.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 21306801415 in words is "twenty-one billion, three hundred six million, eight hundred one thousand, four hundred fifteen".