22010788781 has 2 divisors, whose sum is σ = 22010788782. Its totient is φ = 22010788780.

The previous prime is 22010788757. The next prime is 22010788843. The reversal of 22010788781 is 18788701022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21537030025 + 473758756 = 146755^2 + 21766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22010788781 is a prime.

It is a super-2 number, since 2×22010788781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22010788181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11005394390 + 11005394391.

It is an arithmetic number, because the mean of its divisors is an integer number (11005394391).

Almost surely, 2^22010788781 is an apocalyptic number.

It is an amenable number.

22010788781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22010788781 is an equidigital number, since it uses as much as digits as its factorization.

22010788781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100352, while the sum is 44.

The spelling of 22010788781 in words is "twenty-two billion, ten million, seven hundred eighty-eight thousand, seven hundred eighty-one".