22024220021 has 2 divisors, whose sum is σ = 22024220022. Its totient is φ = 22024220020.

The previous prime is 22024220011. The next prime is 22024220033. The reversal of 22024220021 is 12002242022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17183539396 + 4840680625 = 131086^2 + 69575^2 .

It is a cyclic number.

It is not a de Polignac number, because 22024220021 - 2¹⁸ = 22023957877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22024220011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11012110010 + 11012110011.

It is an arithmetic number, because the mean of its divisors is an integer number (11012110011).

Almost surely, 2^22024220021 is an apocalyptic number.

It is an amenable number.

22024220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22024220021 is an equidigital number, since it uses as much as digits as its factorization.

22024220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 22024220021 its reverse (12002242022), we get a palindrome (34026462043).

The spelling of 22024220021 in words is "twenty-two billion, twenty-four million, two hundred twenty thousand, twenty-one".