1221221111239 has 2 divisors, whose sum is σ = 1221221111240. Its totient is φ = 1221221111238.

The previous prime is 1221221111207. The next prime is 1221221111261. The reversal of 1221221111239 is 9321111221221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221221111239 - 2⁵ = 1221221111207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221221117239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610555619 + 610610555620.

It is an arithmetic number, because the mean of its divisors is an integer number (610610555620).

Almost surely, 2^{1221221111239} is an apocalyptic number.

1221221111239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221111239 is an equidigital number, since it uses as much as digits as its factorization.

1221221111239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 28.

The spelling of 1221221111239 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred thirty-nine".