22033129721 has 2 divisors, whose sum is σ = 22033129722. Its totient is φ = 22033129720.

The previous prime is 22033129711. The next prime is 22033129739. The reversal of 22033129721 is 12792133022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20381845225 + 1651284496 = 142765^2 + 40636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22033129721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22033129711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11016564860 + 11016564861.

It is an arithmetic number, because the mean of its divisors is an integer number (11016564861).

Almost surely, 2^22033129721 is an apocalyptic number.

It is an amenable number.

22033129721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22033129721 is an equidigital number, since it uses as much as digits as its factorization.

22033129721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

It can be divided in two parts, 220331 and 29721, that added together give a palindrome (250052).

The spelling of 22033129721 in words is "twenty-two billion, thirty-three million, one hundred twenty-nine thousand, seven hundred twenty-one".