1221314399 has 2 divisors, whose sum is σ = 1221314400. Its totient is φ = 1221314398.

The previous prime is 1221314383. The next prime is 1221314401. The reversal of 1221314399 is 9934131221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221314399 - 2⁴ = 1221314383 is a prime.

It is a super-2 number, since 2×1221314399² = 2983217722409462402, which contains 22 as substring.

Together with 1221314401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221314359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610657199 + 610657200.

It is an arithmetic number, because the mean of its divisors is an integer number (610657200).

Almost surely, 2^1221314399 is an apocalyptic number.

1221314399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221314399 is an equidigital number, since it uses as much as digits as its factorization.

1221314399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 1221314399 is about 34947.3088949636. The cubic root of 1221314399 is about 1068.9133285992.

The spelling of 1221314399 in words is "one billion, two hundred twenty-one million, three hundred fourteen thousand, three hundred ninety-nine".