21373017 has 4 divisors (see below), whose sum is σ = 28497360. Its totient is φ = 14248676.

The previous prime is 21372991. The next prime is 21373061. The reversal of 21373017 is 71037312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21373017 - 2⁷ = 21372889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21373717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3562167 + ... + 3562172.

It is an arithmetic number, because the mean of its divisors is an integer number (7124340).

Almost surely, 2^21373017 is an apocalyptic number.

It is an amenable number.

21373017 is a deficient number, since it is larger than the sum of its proper divisors (7124343).

21373017 is an equidigital number, since it uses as much as digits as its factorization.

21373017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124342.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 21373017 is about 4623.0960405339. The cubic root of 21373017 is about 277.5163727049.

The spelling of 21373017 in words is "twenty-one million, three hundred seventy-three thousand, seventeen".