21932005 has 8 divisors (see below), whose sum is σ = 26371872. Its totient is φ = 17509968.

The previous prime is 21931997. The next prime is 21932039. The reversal of 21932005 is 50023912.

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 21932005 - 2³ = 21931997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1579 + ... + 6808.

It is an arithmetic number, because the mean of its divisors is an integer number (3296484).

Almost surely, 2^21932005 is an apocalyptic number.

It is an amenable number.

21932005 is a deficient number, since it is larger than the sum of its proper divisors (4439867).

21932005 is an equidigital number, since it uses as much as digits as its factorization.

21932005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8915.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 21932005 is about 4683.1618592571. The cubic root of 21932005 is about 279.9149614205.

Adding to 21932005 its reverse (50023912), we get a palindrome (71955917).

The spelling of 21932005 in words is "twenty-one million, nine hundred thirty-two thousand, five".