1232221211909 has 2 divisors, whose sum is σ = 1232221211910. Its totient is φ = 1232221211908.

The previous prime is 1232221211887. The next prime is 1232221211929. The reversal of 1232221211909 is 9091121222321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690079104100 + 542142107809 = 830710^2 + 736303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1232221211909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232221211929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616110605954 + 616110605955.

It is an arithmetic number, because the mean of its divisors is an integer number (616110605955).

Almost surely, 2^{1232221211909} is an apocalyptic number.

It is an amenable number.

1232221211909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232221211909 is an equidigital number, since it uses as much as digits as its factorization.

1232221211909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 1232221211909 in words is "one trillion, two hundred thirty-two billion, two hundred twenty-one million, two hundred eleven thousand, nine hundred nine".