21982858 has 4 divisors (see below), whose sum is σ = 32974290. Its totient is φ = 10991428.

The previous prime is 21982843. The next prime is 21982861. The reversal of 21982858 is 85828912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20766249 + 1216609 = 4557^2 + 1103^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495713 + ... + 5495716.

Almost surely, 2^21982858 is an apocalyptic number.

21982858 is a deficient number, since it is larger than the sum of its proper divisors (10991432).

21982858 is a wasteful number, since it uses less digits than its factorization.

21982858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10991431.

The product of its digits is 92160, while the sum is 43.

The square root of 21982858 is about 4688.5880603866. The cubic root of 21982858 is about 280.1311375519.

The spelling of 21982858 in words is "twenty-one million, nine hundred eighty-two thousand, eight hundred fifty-eight".