21940874 has 8 divisors (see below), whose sum is σ = 32931360. Its totient is φ = 10963756.

The previous prime is 21940843. The next prime is 21940909. The reversal of 21940874 is 47804912.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3917 + ... + 7695.

It is an arithmetic number, because the mean of its divisors is an integer number (4116420).

Almost surely, 2^21940874 is an apocalyptic number.

21940874 is a deficient number, since it is larger than the sum of its proper divisors (10990486).

21940874 is a wasteful number, since it uses less digits than its factorization.

21940874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6684.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21940874 is about 4684.1086665448. The cubic root of 21940874 is about 279.9526875842.

The spelling of 21940874 in words is "twenty-one million, nine hundred forty thousand, eight hundred seventy-four".