121923999 has 12 divisors (see below), whose sum is σ = 177132696. Its totient is φ = 80811792.

The previous prime is 121923979. The next prime is 121924001. The reversal of 121923999 is 999329121.

It is not a de Polignac number, because 121923999 - 2¹⁹ = 121399711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121923959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37597 + ... + 40710.

It is an arithmetic number, because the mean of its divisors is an integer number (14761058).

Almost surely, 2^121923999 is an apocalyptic number.

121923999 is a deficient number, since it is larger than the sum of its proper divisors (55208697).

121923999 is a wasteful number, since it uses less digits than its factorization.

121923999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78486 (or 78483 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 121923999 is about 11041.9200775952. The cubic root of 121923999 is about 495.8645558350.

It can be divided in two parts, 121 and 923999, that added together give a triangular number (924120 = T₁₃₅₉).

The spelling of 121923999 in words is "one hundred twenty-one million, nine hundred twenty-three thousand, nine hundred ninety-nine".