22059721 has 2 divisors, whose sum is σ = 22059722. Its totient is φ = 22059720.

The previous prime is 22059701. The next prime is 22059743. The reversal of 22059721 is 12795022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 4928400 = 4139^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 22059721 - 2¹³ = 22051529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22059721.

It is not a weakly prime, because it can be changed into another prime (22059701) by changing a digit.

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 as a sum of consecutive naturals, namely, 11029860 + 11029861.

It is an arithmetic number, because the mean of its divisors is an integer number (11029861).

Almost surely, 2^22059721 is an apocalyptic number.

It is an amenable number.

22059721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22059721 is an equidigital number, since it uses as much as digits as its factorization.

22059721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 22059721 is about 4696.7777252069. Note that the first 4 decimals coincide. The cubic root of 22059721 is about 280.4572503358.

The spelling of 22059721 in words is "twenty-two million, fifty-nine thousand, seven hundred twenty-one".