121538419 has 4 divisors (see below), whose sum is σ = 123076960. Its totient is φ = 119999880.

The previous prime is 121538399. The next prime is 121538429. The reversal of 121538419 is 914835121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 914835121 = 281 ⋅3255641.

It is a cyclic number.

It is not a de Polignac number, because 121538419 - 2⁹ = 121537907 is a prime.

It is a super-2 number, since 2×121538419² = 29543174586039122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121538429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769152 + ... + 769309.

It is an arithmetic number, because the mean of its divisors is an integer number (30769240).

Almost surely, 2^121538419 is an apocalyptic number.

121538419 is a deficient number, since it is larger than the sum of its proper divisors (1538541).

121538419 is an equidigital number, since it uses as much as digits as its factorization.

121538419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538540.

The product of its digits is 8640, while the sum is 34.

The square root of 121538419 is about 11024.4464260116. The cubic root of 121538419 is about 495.3412862537.

The spelling of 121538419 in words is "one hundred twenty-one million, five hundred thirty-eight thousand, four hundred nineteen".