1221221101039 has 2 divisors, whose sum is σ = 1221221101040. Its totient is φ = 1221221101038.

The previous prime is 1221221100977. The next prime is 1221221101043. The reversal of 1221221101039 is 9301011221221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221221101039 - 2⁹ = 1221221100527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221221101439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610550519 + 610610550520.

It is an arithmetic number, because the mean of its divisors is an integer number (610610550520).

Almost surely, 2^{1221221101039} is an apocalyptic number.

1221221101039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221101039 is an equidigital number, since it uses as much as digits as its factorization.

1221221101039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 1221221101039 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, thirty-nine".