121434139 has 4 divisors (see below), whose sum is σ = 122971360. Its totient is φ = 119896920.

The previous prime is 121434109. The next prime is 121434151. The reversal of 121434139 is 931434121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931434121 = 59 ⋅15787019.

It is a cyclic number.

It is not a de Polignac number, because 121434139 - 2⁷ = 121434011 is a prime.

It is a super-2 number, since 2×121434139² = 29492500229342642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121434109) 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, 768492 + ... + 768649.

It is an arithmetic number, because the mean of its divisors is an integer number (30742840).

Almost surely, 2^121434139 is an apocalyptic number.

121434139 is a deficient number, since it is larger than the sum of its proper divisors (1537221).

121434139 is an equidigital number, since it uses as much as digits as its factorization.

121434139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537220.

The product of its digits is 2592, while the sum is 28.

The square root of 121434139 is about 11019.7159219283. The cubic root of 121434139 is about 495.1995780600.

It can be divided in two parts, 1214 and 34139, that added together give a palindrome (35353).

The spelling of 121434139 in words is "one hundred twenty-one million, four hundred thirty-four thousand, one hundred thirty-nine".