121230542639 has 2 divisors, whose sum is σ = 121230542640. Its totient is φ = 121230542638.

The previous prime is 121230542633. The next prime is 121230542669. The reversal of 121230542639 is 936245032121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121230542639 - 2²⁸ = 120962107183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121230542633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615271319 + 60615271320.

It is an arithmetic number, because the mean of its divisors is an integer number (60615271320).

Almost surely, 2^121230542639 is an apocalyptic number.

121230542639 is a deficient number, since it is larger than the sum of its proper divisors (1).

121230542639 is an equidigital number, since it uses as much as digits as its factorization.

121230542639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 121230542639 in words is "one hundred twenty-one billion, two hundred thirty million, five hundred forty-two thousand, six hundred thirty-nine".