21970933 has 8 divisors (see below), whose sum is σ = 22709408. Its totient is φ = 21240144.

The previous prime is 21970931. The next prime is 21970937. The reversal of 21970933 is 33907912.

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

It is a cyclic number.

It is not a de Polignac number, because 21970933 - 2¹ = 21970931 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 (21970931) 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, 4210 + ... + 7852.

It is an arithmetic number, because the mean of its divisors is an integer number (2838676).

Almost surely, 2^21970933 is an apocalyptic number.

It is an amenable number.

21970933 is a deficient number, since it is larger than the sum of its proper divisors (738475).

21970933 is a wasteful number, since it uses less digits than its factorization.

21970933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3843.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 21970933 is about 4687.3161830625. The cubic root of 21970933 is about 280.0804743178.

The spelling of 21970933 in words is "twenty-one million, nine hundred seventy thousand, nine hundred thirty-three".