21959722 has 8 divisors (see below), whose sum is σ = 33829956. Its totient is φ = 10683072.

The previous prime is 21959689. The next prime is 21959761. The reversal of 21959722 is 22795912.

It can be written as a sum of positive squares in 2 ways, for example, as 21911761 + 47961 = 4681^2 + 219^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148303 + ... + 148450.

Almost surely, 2^21959722 is an apocalyptic number.

21959722 is a deficient number, since it is larger than the sum of its proper divisors (11870234).

21959722 is a wasteful number, since it uses less digits than its factorization.

21959722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296792.

The product of its digits is 22680, while the sum is 37.

The square root of 21959722 is about 4686.1201435729. The cubic root of 21959722 is about 280.0328277837.

The spelling of 21959722 in words is "twenty-one million, nine hundred fifty-nine thousand, seven hundred twenty-two".