21932541 has 6 divisors (see below), whose sum is σ = 31680350. Its totient is φ = 14621688.

The previous prime is 21932507. The next prime is 21932543. The reversal of 21932541 is 14523912.

It can be written as a sum of positive squares in only one way, i.e., 13111641 + 8820900 = 3621^2 + 2970^2 .

It is not a de Polignac number, because 21932541 - 2¹⁴ = 21916157 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 (21932543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1218466 + ... + 1218483.

Almost surely, 2^21932541 is an apocalyptic number.

It is an amenable number.

21932541 is a deficient number, since it is larger than the sum of its proper divisors (9747809).

21932541 is a wasteful number, since it uses less digits than its factorization.

21932541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436955 (or 2436952 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21932541 is about 4683.2190852020. The cubic root of 21932541 is about 279.9172416984.

The spelling of 21932541 in words is "twenty-one million, nine hundred thirty-two thousand, five hundred forty-one".