21732953 has 32 divisors (see below), whose sum is σ = 27205632. Its totient is φ = 17107200.

The previous prime is 21732943. The next prime is 21732983. The reversal of 21732953 is 35923712.

It is not a de Polignac number, because 21732953 - 2⁶ = 21732889 is a prime.

It is a super-2 number, since 2×21732953² = 944642492200418, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21732913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133250 + ... + 133412.

It is an arithmetic number, because the mean of its divisors is an integer number (850176).

Almost surely, 2^21732953 is an apocalyptic number.

21732953 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21732953 is a deficient number, since it is larger than the sum of its proper divisors (5472679).

21732953 is a wasteful number, since it uses less digits than its factorization.

21732953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245.

The product of its digits is 11340, while the sum is 32.

The square root of 21732953 is about 4661.8615380554. The cubic root of 21732953 is about 279.0655627150.

The spelling of 21732953 in words is "twenty-one million, seven hundred thirty-two thousand, nine hundred fifty-three".