121243415 has 4 divisors (see below), whose sum is σ = 145492104. Its totient is φ = 96994728.

The previous prime is 121243399. The next prime is 121243457. The reversal of 121243415 is 514342121.

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 121243415 - 2⁴ = 121243399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12124337 + ... + 12124346.

It is an arithmetic number, because the mean of its divisors is an integer number (36373026).

Almost surely, 2^121243415 is an apocalyptic number.

121243415 is a deficient number, since it is larger than the sum of its proper divisors (24248689).

121243415 is an equidigital number, since it uses as much as digits as its factorization.

121243415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24248688.

The product of its digits is 960, while the sum is 23.

The square root of 121243415 is about 11011.0587592656. The cubic root of 121243415 is about 494.9401893520.

Adding to 121243415 its reverse (514342121), we get a palindrome (635585536).

The spelling of 121243415 in words is "one hundred twenty-one million, two hundred forty-three thousand, four hundred fifteen".