21271982 has 16 divisors (see below), whose sum is σ = 33728400. Its totient is φ = 10033920.

The previous prime is 21271973. The next prime is 21272011. The reversal of 21271982 is 28917212.

It is a happy number.

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, 9182 + ... + 11262.

It is an arithmetic number, because the mean of its divisors is an integer number (2108025).

Almost surely, 2^21271982 is an apocalyptic number.

21271982 is a deficient number, since it is larger than the sum of its proper divisors (12456418).

21271982 is a wasteful number, since it uses less digits than its factorization.

21271982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371.

The product of its digits is 4032, while the sum is 32.

The square root of 21271982 is about 4612.1558950235. The cubic root of 21271982 is about 277.0783879771.

The spelling of 21271982 in words is "twenty-one million, two hundred seventy-one thousand, nine hundred eighty-two".