21431476 has 12 divisors (see below), whose sum is σ = 40914720. Its totient is φ = 9741560.

The previous prime is 21431401. The next prime is 21431489. The reversal of 21431476 is 67413412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243496 + ... + 243583.

It is an arithmetic number, because the mean of its divisors is an integer number (3409560).

Almost surely, 2^21431476 is an apocalyptic number.

It is an amenable number.

21431476 is a deficient number, since it is larger than the sum of its proper divisors (19483244).

21431476 is a wasteful number, since it uses less digits than its factorization.

21431476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487094 (or 487092 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 21431476 is about 4629.4142178034. The cubic root of 21431476 is about 277.7691612379.

Adding to 21431476 its reverse (67413412), we get a palindrome (88844888).

The spelling of 21431476 in words is "twenty-one million, four hundred thirty-one thousand, four hundred seventy-six".