21983716 has 6 divisors (see below), whose sum is σ = 38471510. Its totient is φ = 10991856.

The previous prime is 21983701. The next prime is 21983747. The reversal of 21983716 is 61738912.

It can be written as a sum of positive squares in only one way, i.e., 13838400 + 8145316 = 3720^2 + 2854^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2747961 + ... + 2747968.

Almost surely, 2^21983716 is an apocalyptic number.

It is an amenable number.

21983716 is a deficient number, since it is larger than the sum of its proper divisors (16487794).

21983716 is a wasteful number, since it uses less digits than its factorization.

21983716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5495933 (or 5495931 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 21983716 is about 4688.6795582552. The cubic root of 21983716 is about 280.1347820491.

The spelling of 21983716 in words is "twenty-one million, nine hundred eighty-three thousand, seven hundred sixteen".