21313474 has 32 divisors (see below), whose sum is σ = 39626496. Its totient is φ = 8372160.

The previous prime is 21313469. The next prime is 21313483. The reversal of 21313474 is 47431312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32619 + ... + 33265.

It is an arithmetic number, because the mean of its divisors is an integer number (1238328).

Almost surely, 2^21313474 is an apocalyptic number.

21313474 is a deficient number, since it is larger than the sum of its proper divisors (18313022).

21313474 is a wasteful number, since it uses less digits than its factorization.

21313474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850.

The product of its digits is 2016, while the sum is 25.

The square root of 21313474 is about 4616.6518170640. The cubic root of 21313474 is about 277.2584224425.

Adding to 21313474 its reverse (47431312), we get a palindrome (68744786).

The spelling of 21313474 in words is "twenty-one million, three hundred thirteen thousand, four hundred seventy-four".