1320268121 has 2 divisors, whose sum is σ = 1320268122. Its totient is φ = 1320268120.

The previous prime is 1320268091. The next prime is 1320268139. The reversal of 1320268121 is 1218620231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1319142400 + 1125721 = 36320^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320268121 - 2¹⁸ = 1320005977 is a prime.

It is a super-2 number, since 2×1320268121² = 3486215822657741282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1320268141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660134060 + 660134061.

It is an arithmetic number, because the mean of its divisors is an integer number (660134061).

Almost surely, 2^1320268121 is an apocalyptic number.

It is an amenable number.

1320268121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320268121 is an equidigital number, since it uses as much as digits as its factorization.

1320268121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1320268121 is about 36335.4939556352. The cubic root of 1320268121 is about 1097.0355777723.

Adding to 1320268121 its reverse (1218620231), we get a palindrome (2538888352).

The spelling of 1320268121 in words is "one billion, three hundred twenty million, two hundred sixty-eight thousand, one hundred twenty-one".