21932087 has 8 divisors (see below), whose sum is σ = 22936704. Its totient is φ = 20931768.

The previous prime is 21932077. The next prime is 21932143. The reversal of 21932087 is 78023912.

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 21932087 - 2¹⁸ = 21669943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21932077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14048 + ... + 15530.

It is an arithmetic number, because the mean of its divisors is an integer number (2867088).

Almost surely, 2^21932087 is an apocalyptic number.

21932087 is a deficient number, since it is larger than the sum of its proper divisors (1004617).

21932087 is a wasteful number, since it uses less digits than its factorization.

21932087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21932087 is about 4683.1706140178. The cubic root of 21932087 is about 279.9153102714.

Adding to 21932087 its reverse (78023912), we get a palindrome (99955999).

The spelling of 21932087 in words is "twenty-one million, nine hundred thirty-two thousand, eighty-seven".