21513334 has 4 divisors (see below), whose sum is σ = 32270004. Its totient is φ = 10756666.

The previous prime is 21513329. The next prime is 21513361. The reversal of 21513334 is 43331512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378332 + ... + 5378335.

It is an arithmetic number, because the mean of its divisors is an integer number (8067501).

Almost surely, 2^21513334 is an apocalyptic number.

21513334 is a deficient number, since it is larger than the sum of its proper divisors (10756670).

21513334 is a wasteful number, since it uses less digits than its factorization.

21513334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10756669.

The product of its digits is 1080, while the sum is 22.

The square root of 21513334 is about 4638.2468670824. The cubic root of 21513334 is about 278.1223604345.

Adding to 21513334 its reverse (43331512), we get a palindrome (64844846).

The spelling of 21513334 in words is "twenty-one million, five hundred thirteen thousand, three hundred thirty-four".