21479710 has 16 divisors (see below), whose sum is σ = 44186976. Its totient is φ = 7364448.

The previous prime is 21479693. The next prime is 21479729. The reversal of 21479710 is 1797412.

It is a super-2 number, since 2×21479710² = 922755883368200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153357 + ... + 153496.

It is an arithmetic number, because the mean of its divisors is an integer number (2761686).

Almost surely, 2^21479710 is an apocalyptic number.

21479710 is an abundant number, since it is smaller than the sum of its proper divisors (22707266).

21479710 is a wasteful number, since it uses less digits than its factorization.

21479710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306867.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 21479710 is about 4634.6208043377. The cubic root of 21479710 is about 277.9773889103.

The spelling of 21479710 in words is "twenty-one million, four hundred seventy-nine thousand, seven hundred ten".