121899019 has 8 divisors (see below), whose sum is σ = 133361712. Its totient is φ = 110499840.

The previous prime is 121899017. The next prime is 121899031. The reversal of 121899019 is 910998121.

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

It is not a de Polignac number, because 121899019 - 2¹ = 121899017 is a prime.

It is a super-2 number, since 2×121899019² = 29718741666324722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121899013) 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, 11814 + ... + 19579.

It is an arithmetic number, because the mean of its divisors is an integer number (16670214).

Almost surely, 2^121899019 is an apocalyptic number.

121899019 is a deficient number, since it is larger than the sum of its proper divisors (11462693).

121899019 is a wasteful number, since it uses less digits than its factorization.

121899019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31757.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 121899019 is about 11040.7888758005. The cubic root of 121899019 is about 495.8306889925.

The spelling of 121899019 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, nineteen".