121864869 has 24 divisors (see below), whose sum is σ = 202076160. Its totient is φ = 69324768.

The previous prime is 121864859. The next prime is 121864871. The reversal of 121864869 is 968468121.

It is not a de Polignac number, because 121864869 - 2⁵ = 121864837 is a prime.

It is a super-2 number, since 2×121864869² = 29702092592774322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121864849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10204 + ... + 18650.

It is an arithmetic number, because the mean of its divisors is an integer number (8419840).

Almost surely, 2^121864869 is an apocalyptic number.

It is an amenable number.

121864869 is a deficient number, since it is larger than the sum of its proper divisors (80211291).

121864869 is a wasteful number, since it uses less digits than its factorization.

121864869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8689 (or 8686 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 121864869 is about 11039.2422294286. The cubic root of 121864869 is about 495.7843823592.

The spelling of 121864869 in words is "one hundred twenty-one million, eight hundred sixty-four thousand, eight hundred sixty-nine".