21370715 has 8 divisors (see below), whose sum is σ = 25706688. Its totient is φ = 17055360.

The previous prime is 21370693. The next prime is 21370721. The reversal of 21370715 is 51707312.

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

It is not a de Polignac number, because 21370715 - 2¹² = 21366619 is a prime.

It is a super-2 number, since 2×21370715² = 913414919222450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2771 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (3213336).

Almost surely, 2^21370715 is an apocalyptic number.

21370715 is a deficient number, since it is larger than the sum of its proper divisors (4335973).

21370715 is an equidigital number, since it uses as much as digits as its factorization.

21370715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10309.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 21370715 is about 4622.8470664732. The cubic root of 21370715 is about 277.5064089638.

The spelling of 21370715 in words is "twenty-one million, three hundred seventy thousand, seven hundred fifteen".