21713486 has 8 divisors (see below), whose sum is σ = 32637000. Its totient is φ = 10834488.

The previous prime is 21713479. The next prime is 21713491. The reversal of 21713486 is 68431712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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, 9881 + ... + 11876.

It is an arithmetic number, because the mean of its divisors is an integer number (4079625).

Almost surely, 2^21713486 is an apocalyptic number.

21713486 is a deficient number, since it is larger than the sum of its proper divisors (10923514).

21713486 is a wasteful number, since it uses less digits than its factorization.

21713486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22258.

The product of its digits is 8064, while the sum is 32.

The square root of 21713486 is about 4659.7731704451. The cubic root of 21713486 is about 278.9822147508.

The spelling of 21713486 in words is "twenty-one million, seven hundred thirteen thousand, four hundred eighty-six".