22212231997 has 2 divisors, whose sum is σ = 22212231998. Its totient is φ = 22212231996.

The previous prime is 22212231967. The next prime is 22212232039. The reversal of 22212231997 is 79913221222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13129951396 + 9082280601 = 114586^2 + 95301^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212231997 - 2⁷ = 22212231869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22212231907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11106115998 + 11106115999.

It is an arithmetic number, because the mean of its divisors is an integer number (11106115999).

Almost surely, 2^22212231997 is an apocalyptic number.

It is an amenable number.

22212231997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22212231997 is an equidigital number, since it uses as much as digits as its factorization.

22212231997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The spelling of 22212231997 in words is "twenty-two billion, two hundred twelve million, two hundred thirty-one thousand, nine hundred ninety-seven".