21971322 has 24 divisors (see below), whose sum is σ = 48210240. Its totient is φ = 7230600.

The previous prime is 21971311. The next prime is 21971329. The reversal of 21971322 is 22317912.

It is not an unprimeable number, because it can be changed into a prime (21971329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6304 + ... + 9147.

It is an arithmetic number, because the mean of its divisors is an integer number (2008760).

Almost surely, 2^21971322 is an apocalyptic number.

21971322 is an abundant number, since it is smaller than the sum of its proper divisors (26238918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21971322 is a wasteful number, since it uses less digits than its factorization.

21971322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15538 (or 15535 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 21971322 is about 4687.3576778394. The cubic root of 21971322 is about 280.0821272693.

The spelling of 21971322 in words is "twenty-one million, nine hundred seventy-one thousand, three hundred twenty-two".