1221220121039 has 2 divisors, whose sum is σ = 1221220121040. Its totient is φ = 1221220121038.

The previous prime is 1221220121003. The next prime is 1221220121071. The reversal of 1221220121039 is 9301210221221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221220121039 - 2³⁶ = 1152500644303 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221220120999 and 1221220121017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221220121089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610060519 + 610610060520.

It is an arithmetic number, because the mean of its divisors is an integer number (610610060520).

Almost surely, 2^{1221220121039} is an apocalyptic number.

1221220121039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221220121039 is an equidigital number, since it uses as much as digits as its factorization.

1221220121039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 1221220121039 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, thirty-nine".