21431454 has 32 divisors (see below), whose sum is σ = 46929024. Its totient is φ = 6470880.

The previous prime is 21431401. The next prime is 21431489. The reversal of 21431454 is 45413412.

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 15 ways as a sum of consecutive naturals, for example, 28872 + ... + 29604.

It is an arithmetic number, because the mean of its divisors is an integer number (1466532).

Almost surely, 2^21431454 is an apocalyptic number.

21431454 is an abundant number, since it is smaller than the sum of its proper divisors (25497570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431454 is a wasteful number, since it uses less digits than its factorization.

21431454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192.

The product of its digits is 1920, while the sum is 24.

The square root of 21431454 is about 4629.4118416922. The cubic root of 21431454 is about 277.7690661920.

Adding to 21431454 its reverse (45413412), we get a palindrome (66844866).

The spelling of 21431454 in words is "twenty-one million, four hundred thirty-one thousand, four hundred fifty-four".