21940597 has 8 divisors (see below), whose sum is σ = 26165376. Its totient is φ = 17988432.

The previous prime is 21940577. The next prime is 21940601. The reversal of 21940597 is 79504912.

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

It is not a de Polignac number, because 21940597 - 2¹¹ = 21938549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21940537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67978 + ... + 68299.

It is an arithmetic number, because the mean of its divisors is an integer number (3270672).

Almost surely, 2^21940597 is an apocalyptic number.

It is an amenable number.

21940597 is a deficient number, since it is larger than the sum of its proper divisors (4224779).

21940597 is a wasteful number, since it uses less digits than its factorization.

21940597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136307.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 21940597 is about 4684.0790983928. The cubic root of 21940597 is about 279.9515094600.

The spelling of 21940597 in words is "twenty-one million, nine hundred forty thousand, five hundred ninety-seven".