21847982 has 24 divisors (see below), whose sum is σ = 36466776. Its totient is φ = 9805536.

The previous prime is 21847961. The next prime is 21847993. The reversal of 21847982 is 28974812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11633 + ... + 13379.

It is an arithmetic number, because the mean of its divisors is an integer number (1519449).

Almost surely, 2^21847982 is an apocalyptic number.

21847982 is a deficient number, since it is larger than the sum of its proper divisors (14618794).

21847982 is a wasteful number, since it uses less digits than its factorization.

21847982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812 (or 1799 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 21847982 is about 4674.1824953675. The cubic root of 21847982 is about 279.5570462251.

The spelling of 21847982 in words is "twenty-one million, eight hundred forty-seven thousand, nine hundred eighty-two".