21132454 has 16 divisors (see below), whose sum is σ = 36295200. Its totient is φ = 9039744.

The previous prime is 21132383. The next prime is 21132481. The reversal of 21132454 is 45423112.

It is a super-2 number, since 2×21132454² = 893161224124232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8862 + ... + 10990.

It is an arithmetic number, because the mean of its divisors is an integer number (2268450).

Almost surely, 2^21132454 is an apocalyptic number.

21132454 is a deficient number, since it is larger than the sum of its proper divisors (15162746).

21132454 is a wasteful number, since it uses less digits than its factorization.

21132454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847.

The product of its digits is 960, while the sum is 22.

The square root of 21132454 is about 4597.0048944938. The cubic root of 21132454 is about 276.4712508545.

Adding to 21132454 its reverse (45423112), we get a palindrome (66555566).

The spelling of 21132454 in words is "twenty-one million, one hundred thirty-two thousand, four hundred fifty-four".