1221322122989 has 2 divisors, whose sum is σ = 1221322122990. Its totient is φ = 1221322122988.

The previous prime is 1221322122931. The next prime is 1221322123013. The reversal of 1221322122989 is 9892212231221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998970265225 + 222351857764 = 999485^2 + 471542^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221322122989 - 2²⁴ = 1221305345773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221322122919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610661061494 + 610661061495.

It is an arithmetic number, because the mean of its divisors is an integer number (610661061495).

Almost surely, 2^{1221322122989} is an apocalyptic number.

It is an amenable number.

1221322122989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221322122989 is an equidigital number, since it uses as much as digits as its factorization.

1221322122989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The spelling of 1221322122989 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-two million, one hundred twenty-two thousand, nine hundred eighty-nine".