139111212121 has 32 divisors (see below), whose sum is σ = 168564960000. Its totient is φ = 114617494656.

The previous prime is 139111212077. The next prime is 139111212197. The reversal of 139111212121 is 121212111931.

It is a happy number.

It is not a de Polignac number, because 139111212121 - 2¹³ = 139111203929 is a prime.

It is a Duffinian number.

139111212121 is a modest number, since divided by 212121 gives 139111 as remainder.

It is not an unprimeable number, because it can be changed into a prime (139111312121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2227165 + ... + 2288773.

It is an arithmetic number, because the mean of its divisors is an integer number (5267655000).

Almost surely, 2^139111212121 is an apocalyptic number.

It is an amenable number.

139111212121 is a deficient number, since it is larger than the sum of its proper divisors (29453747879).

139111212121 is an equidigital number, since it uses as much as digits as its factorization.

139111212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61886 (or 61872 counting only the distinct ones).

The product of its digits is 216, while the sum is 25.

The spelling of 139111212121 in words is "one hundred thirty-nine billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".