1221332993 has 2 divisors, whose sum is σ = 1221332994. Its totient is φ = 1221332992.

The previous prime is 1221332971. The next prime is 1221333011. The reversal of 1221332993 is 3992331221.

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., 1071711169 + 149621824 = 32737^2 + 12232^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221332993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221332933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610666496 + 610666497.

It is an arithmetic number, because the mean of its divisors is an integer number (610666497).

Almost surely, 2^1221332993 is an apocalyptic number.

It is an amenable number.

1221332993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221332993 is an equidigital number, since it uses as much as digits as its factorization.

1221332993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 35.

The square root of 1221332993 is about 34947.5749230186. The cubic root of 1221332993 is about 1068.9187531575.

The spelling of 1221332993 in words is "one billion, two hundred twenty-one million, three hundred thirty-two thousand, nine hundred ninety-three".