121899823 has 8 divisors (see below), whose sum is σ = 123971760. Its totient is φ = 119845440.

The previous prime is 121899821. The next prime is 121899887. The reversal of 121899823 is 328998121.

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 121899823 - 2¹ = 121899821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121899823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121899821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10011 + ... + 18547.

It is an arithmetic number, because the mean of its divisors is an integer number (15496470).

Almost surely, 2^121899823 is an apocalyptic number.

121899823 is a deficient number, since it is larger than the sum of its proper divisors (2071937).

121899823 is a wasteful number, since it uses less digits than its factorization.

121899823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8777.

The product of its digits is 62208, while the sum is 43.

The square root of 121899823 is about 11040.8252861822. The cubic root of 121899823 is about 495.8317790942.

The spelling of 121899823 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, eight hundred twenty-three".