121869919 has 8 divisors (see below), whose sum is σ = 128756160. Its totient is φ = 115162656.

The previous prime is 121869883. The next prime is 121869953. The reversal of 121869919 is 919968121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121869919 - 2⁷ = 121869791 is a prime.

It is a super-2 number, since 2×121869919² = 29704554314133122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121861919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43344 + ... + 46069.

It is an arithmetic number, because the mean of its divisors is an integer number (16094520).

Almost surely, 2^121869919 is an apocalyptic number.

121869919 is a deficient number, since it is larger than the sum of its proper divisors (6886241).

121869919 is an equidigital number, since it uses as much as digits as its factorization.

121869919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89489.

The product of its digits is 69984, while the sum is 46.

The square root of 121869919 is about 11039.4709565269. The cubic root of 121869919 is about 495.7912305909.

The spelling of 121869919 in words is "one hundred twenty-one million, eight hundred sixty-nine thousand, nine hundred nineteen".