21969722 has 8 divisors (see below), whose sum is σ = 33281172. Its totient is φ = 10876000.

The previous prime is 21969709. The next prime is 21969781. The reversal of 21969722 is 22796912.

It can be written as a sum of positive squares in 2 ways, for example, as 16638241 + 5331481 = 4079^2 + 2309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54179 + ... + 54582.

Almost surely, 2^21969722 is an apocalyptic number.

21969722 is a deficient number, since it is larger than the sum of its proper divisors (11311450).

21969722 is a wasteful number, since it uses less digits than its factorization.

21969722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108864.

The product of its digits is 27216, while the sum is 38.

The square root of 21969722 is about 4687.1870028835. The cubic root of 21969722 is about 280.0753283721.

The spelling of 21969722 in words is "twenty-one million, nine hundred sixty-nine thousand, seven hundred twenty-two".