21380708 has 24 divisors (see below), whose sum is σ = 39221952. Its totient is φ = 10178784.

The previous prime is 21380693. The next prime is 21380729. The reversal of 21380708 is 80708312.

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, 27866 + ... + 28622.

It is an arithmetic number, because the mean of its divisors is an integer number (1634248).

Almost surely, 2^21380708 is an apocalyptic number.

It is an amenable number.

21380708 is a deficient number, since it is larger than the sum of its proper divisors (17841244).

21380708 is a wasteful number, since it uses less digits than its factorization.

21380708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1089 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21380708 is about 4623.9277676019. The cubic root of 21380708 is about 277.5496564549.

The spelling of 21380708 in words is "twenty-one million, three hundred eighty thousand, seven hundred eight".