121867919 has 8 divisors (see below), whose sum is σ = 128624640. Its totient is φ = 115145496.

The previous prime is 121867897. The next prime is 121867927. The reversal of 121867919 is 919768121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121867919 is a prime.

It is a super-2 number, since 2×121867919² = 29703579362781122, which contains 22 as substring.

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 121867919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121867519) 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, 1097 + ... + 15650.

It is an arithmetic number, because the mean of its divisors is an integer number (16078080).

Almost surely, 2^121867919 is an apocalyptic number.

121867919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121867919 is a deficient number, since it is larger than the sum of its proper divisors (6756721).

121867919 is a wasteful number, since it uses less digits than its factorization.

121867919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17149.

The product of its digits is 54432, while the sum is 44.

The square root of 121867919 is about 11039.3803721042. The cubic root of 121867919 is about 495.7885184425.

The spelling of 121867919 in words is "one hundred twenty-one million, eight hundred sixty-seven thousand, nine hundred nineteen".