21374617 has 4 divisors (see below), whose sum is σ = 23317776. Its totient is φ = 19431460.

The previous prime is 21374611. The next prime is 21374657. The reversal of 21374617 is 71647312.

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 21374617 - 2³ = 21374609 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21374611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 971563 + ... + 971584.

It is an arithmetic number, because the mean of its divisors is an integer number (5829444).

Almost surely, 2^21374617 is an apocalyptic number.

It is an amenable number.

21374617 is a deficient number, since it is larger than the sum of its proper divisors (1943159).

21374617 is a wasteful number, since it uses less digits than its factorization.

21374617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943158.

The product of its digits is 7056, while the sum is 31.

The square root of 21374617 is about 4623.2690815050. The cubic root of 21374617 is about 277.5232975597.

The spelling of 21374617 in words is "twenty-one million, three hundred seventy-four thousand, six hundred seventeen".