1221214024399 has 2 divisors, whose sum is σ = 1221214024400. Its totient is φ = 1221214024398.

The previous prime is 1221214024363. The next prime is 1221214024409. The reversal of 1221214024399 is 9934204121221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221214024399 - 2⁷ = 1221214024271 is a prime.

It is a super-2 number, since 2×1221214024399² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221214024699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610607012199 + 610607012200.

It is an arithmetic number, because the mean of its divisors is an integer number (610607012200).

Almost surely, 2^{1221214024399} is an apocalyptic number.

1221214024399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221214024399 is an equidigital number, since it uses as much as digits as its factorization.

1221214024399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 1221214024399 in words is "one trillion, two hundred twenty-one billion, two hundred fourteen million, twenty-four thousand, three hundred ninety-nine".