121798667 has 4 divisors (see below), whose sum is σ = 124390176. Its totient is φ = 119207160.

The previous prime is 121798643. The next prime is 121798669. The reversal of 121798667 is 766897121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121798667 - 2⁶ = 121798603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 2591461 = 121798667 / (1 + 2 + 1 + 7 + 9 + 8 + 6 + 6 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121798669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295684 + ... + 1295777.

It is an arithmetic number, because the mean of its divisors is an integer number (31097544).

Almost surely, 2^121798667 is an apocalyptic number.

121798667 is a deficient number, since it is larger than the sum of its proper divisors (2591509).

121798667 is an equidigital number, since it uses as much as digits as its factorization.

121798667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591508.

The product of its digits is 254016, while the sum is 47.

The square root of 121798667 is about 11036.2433372955. The cubic root of 121798667 is about 495.6945892872.

The spelling of 121798667 in words is "one hundred twenty-one million, seven hundred ninety-eight thousand, six hundred sixty-seven".