121024128139 has 2 divisors, whose sum is σ = 121024128140. Its totient is φ = 121024128138.

The previous prime is 121024128109. The next prime is 121024128149. The reversal of 121024128139 is 931821420121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121024128139 - 2¹⁵ = 121024095371 is a prime.

It is not a weakly prime, because it can be changed into another prime (121024128109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60512064069 + 60512064070.

It is an arithmetic number, because the mean of its divisors is an integer number (60512064070).

Almost surely, 2^121024128139 is an apocalyptic number.

121024128139 is a deficient number, since it is larger than the sum of its proper divisors (1).

121024128139 is an equidigital number, since it uses as much as digits as its factorization.

121024128139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 121024128139 in words is "one hundred twenty-one billion, twenty-four million, one hundred twenty-eight thousand, one hundred thirty-nine".