121218859 has 4 divisors (see below), whose sum is σ = 121457520. Its totient is φ = 120980200.

The previous prime is 121218767. The next prime is 121218871. The reversal of 121218859 is 958812121.

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 121218859 - 2¹¹ = 121216811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121218899) 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, 118567 + ... + 119584.

It is an arithmetic number, because the mean of its divisors is an integer number (30364380).

Almost surely, 2^121218859 is an apocalyptic number.

121218859 is a deficient number, since it is larger than the sum of its proper divisors (238661).

121218859 is an equidigital number, since it uses as much as digits as its factorization.

121218859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238660.

The product of its digits is 11520, while the sum is 37.

The square root of 121218859 is about 11009.9436419993. The cubic root of 121218859 is about 494.9067729065.

The spelling of 121218859 in words is "one hundred twenty-one million, two hundred eighteen thousand, eight hundred fifty-nine".