21132344 has 8 divisors (see below), whose sum is σ = 39623160. Its totient is φ = 10566168.

The previous prime is 21132341. The next prime is 21132383. The reversal of 21132344 is 44323112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320764 + ... + 1320779.

It is an arithmetic number, because the mean of its divisors is an integer number (4952895).

Almost surely, 2^21132344 is an apocalyptic number.

It is an amenable number.

21132344 is a deficient number, since it is larger than the sum of its proper divisors (18490816).

21132344 is a wasteful number, since it uses less digits than its factorization.

21132344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641549 (or 2641545 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 21132344 is about 4596.9929301664. The cubic root of 21132344 is about 276.4707711518.

Adding to 21132344 its reverse (44323112), we get a palindrome (65455456).

The spelling of 21132344 in words is "twenty-one million, one hundred thirty-two thousand, three hundred forty-four".