21513674 has 32 divisors (see below), whose sum is σ = 40656000. Its totient is φ = 8309952.

The previous prime is 21513649. The next prime is 21513689. The reversal of 21513674 is 47631512.

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, 6452 + ... + 9200.

It is an arithmetic number, because the mean of its divisors is an integer number (1270500).

Almost surely, 2^21513674 is an apocalyptic number.

21513674 is a deficient number, since it is larger than the sum of its proper divisors (19142326).

21513674 is a wasteful number, since it uses less digits than its factorization.

21513674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2814.

The product of its digits is 5040, while the sum is 29.

The square root of 21513674 is about 4638.2835187168. The cubic root of 21513674 is about 278.1238255895.

The spelling of 21513674 in words is "twenty-one million, five hundred thirteen thousand, six hundred seventy-four".