22012011997 has 2 divisors, whose sum is σ = 22012011998. Its totient is φ = 22012011996.

The previous prime is 22012011979. The next prime is 22012012027. The reversal of 22012011997 is 79911021022.

It is a happy number.

Together with previous prime (22012011979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21185966916 + 826045081 = 145554^2 + 28741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22012011997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22012011907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006005998 + 11006005999.

It is an arithmetic number, because the mean of its divisors is an integer number (11006005999).

Almost surely, 2^22012011997 is an apocalyptic number.

It is an amenable number.

22012011997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22012011997 is an equidigital number, since it uses as much as digits as its factorization.

22012011997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 22012011997 in words is "twenty-two billion, twelve million, eleven thousand, nine hundred ninety-seven".