139122121211 has 4 divisors (see below), whose sum is σ = 140883160800. Its totient is φ = 137361081624.

The previous prime is 139122121207. The next prime is 139122121219. The reversal of 139122121211 is 112121221931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139122121211 - 2² = 139122121207 is a prime.

It is a super-2 number, since 2×139122121211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139122121219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880519676 + ... + 880519833.

It is an arithmetic number, because the mean of its divisors is an integer number (35220790200).

Almost surely, 2^139122121211 is an apocalyptic number.

139122121211 is a deficient number, since it is larger than the sum of its proper divisors (1761039589).

139122121211 is an equidigital number, since it uses as much as digits as its factorization.

139122121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761039588.

The product of its digits is 432, while the sum is 26.

The spelling of 139122121211 in words is "one hundred thirty-nine billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".