21982022 has 4 divisors (see below), whose sum is σ = 32973036. Its totient is φ = 10991010.

The previous prime is 21982019. The next prime is 21982039. The reversal of 21982022 is 22028912.

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

It is a junction number, because it is equal to n+sod(n) for n = 21981982 and 21982000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495504 + ... + 5495507.

It is an arithmetic number, because the mean of its divisors is an integer number (8243259).

Almost surely, 2^21982022 is an apocalyptic number.

21982022 is a deficient number, since it is larger than the sum of its proper divisors (10991014).

21982022 is a wasteful number, since it uses less digits than its factorization.

21982022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10991013.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21982022 is about 4688.4989068997. The cubic root of 21982022 is about 280.1275864122.

The spelling of 21982022 in words is "twenty-one million, nine hundred eighty-two thousand, twenty-two".