21932971 has 8 divisors (see below), whose sum is σ = 22605440. Its totient is φ = 21264768.

The previous prime is 21932969. The next prime is 21932983. The reversal of 21932971 is 17923912.

It is a happy number.

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 21932971 - 2¹ = 21932969 is a prime.

It is a super-3 number, since 3×21932971³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21932921) 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, 11590 + ... + 13348.

It is an arithmetic number, because the mean of its divisors is an integer number (2825680).

Almost surely, 2^21932971 is an apocalyptic number.

21932971 is a deficient number, since it is larger than the sum of its proper divisors (672469).

21932971 is a wasteful number, since it uses less digits than its factorization.

21932971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133.

The product of its digits is 6804, while the sum is 34.

The square root of 21932971 is about 4683.2649935702. The cubic root of 21932971 is about 279.9190709989.

The spelling of 21932971 in words is "twenty-one million, nine hundred thirty-two thousand, nine hundred seventy-one".