21930959 has 8 divisors (see below), whose sum is σ = 23139840. Its totient is φ = 20727576.

The previous prime is 21930917. The next prime is 21930991. The reversal of 21930959 is 95903912.

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 21930959 - 2²⁰ = 20882383 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 (21932959) 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, 8834 + ... + 11040.

It is an arithmetic number, because the mean of its divisors is an integer number (2892480).

Almost surely, 2^21930959 is an apocalyptic number.

21930959 is a deficient number, since it is larger than the sum of its proper divisors (1208881).

21930959 is a wasteful number, since it uses less digits than its factorization.

21930959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 21930959 is about 4683.0501812387. The cubic root of 21930959 is about 279.9105113683.

The spelling of 21930959 in words is "twenty-one million, nine hundred thirty thousand, nine hundred fifty-nine".