121216021439 has 2 divisors, whose sum is σ = 121216021440. Its totient is φ = 121216021438.

The previous prime is 121216021429. The next prime is 121216021481. The reversal of 121216021439 is 934120612121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121216021439 - 2²⁰ = 121214972863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121216021429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60608010719 + 60608010720.

It is an arithmetic number, because the mean of its divisors is an integer number (60608010720).

Almost surely, 2^121216021439 is an apocalyptic number.

121216021439 is a deficient number, since it is larger than the sum of its proper divisors (1).

121216021439 is an equidigital number, since it uses as much as digits as its factorization.

121216021439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 121216021439 in words is "one hundred twenty-one billion, two hundred sixteen million, twenty-one thousand, four hundred thirty-nine".