21932001 has 48 divisors (see below), whose sum is σ = 39719680. Its totient is φ = 11352960.

The previous prime is 21931997. The next prime is 21932039. The reversal of 21932001 is 10023912.

It is a happy number.

It is not a de Polignac number, because 21932001 - 2² = 21931997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21932051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49740 + ... + 50178.

Almost surely, 2^21932001 is an apocalyptic number.

21932001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21932001 is a deficient number, since it is larger than the sum of its proper divisors (17787679).

21932001 is a wasteful number, since it uses less digits than its factorization.

21932001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21932001 is about 4683.1614321951. The cubic root of 21932001 is about 279.9149444034.

Adding to 21932001 its reverse (10023912), we get a palindrome (31955913).

The spelling of 21932001 in words is "twenty-one million, nine hundred thirty-two thousand, one".