22221210997 has 2 divisors, whose sum is σ = 22221210998. Its totient is φ = 22221210996.

The previous prime is 22221210941. The next prime is 22221211063. The reversal of 22221210997 is 79901212222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22119423076 + 101787921 = 148726^2 + 10089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22221210997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22221210797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110605498 + 11110605499.

It is an arithmetic number, because the mean of its divisors is an integer number (11110605499).

Almost surely, 2^22221210997 is an apocalyptic number.

It is an amenable number.

22221210997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221210997 is an equidigital number, since it uses as much as digits as its factorization.

22221210997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 22221210997 in words is "twenty-two billion, two hundred twenty-one million, two hundred ten thousand, nine hundred ninety-seven".