21486308 has 12 divisors (see below), whose sum is σ = 37655100. Its totient is φ = 10727712.

The previous prime is 21486281. The next prime is 21486313. The reversal of 21486308 is 80368412.

It can be written as a sum of positive squares in 2 ways, for example, as 9597604 + 11888704 = 3098^2 + 3448^2 .

It is a super-2 number, since 2×21486308² = 923322862941728, which contains 22 as substring.

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, 383 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (3137925).

Almost surely, 2^21486308 is an apocalyptic number.

It is an amenable number.

21486308 is a deficient number, since it is larger than the sum of its proper divisors (16168792).

21486308 is a wasteful number, since it uses less digits than its factorization.

21486308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7726 (or 7724 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21486308 is about 4635.3325662783. The cubic root of 21486308 is about 278.0058484355.

The spelling of 21486308 in words is "twenty-one million, four hundred eighty-six thousand, three hundred eight".