121243904 has 36 divisors (see below), whose sum is σ = 243851244. Its totient is φ = 60162048.

The previous prime is 121243891. The next prime is 121243933. The reversal of 121243904 is 409342121.

It can be written as a sum of positive squares in 2 ways, for example, as 27541504 + 93702400 = 5248^2 + 9680^2 .

It is a super-2 number, since 2×121243904² = 29400168514322432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33344 + ... + 36800.

Almost surely, 2^121243904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121243904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121925622).

121243904 is an abundant number, since it is smaller than the sum of its proper divisors (122607340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121243904 is an equidigital number, since it uses as much as digits as its factorization.

121243904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610 (or 3596 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 121243904 is about 11011.0809641924. The cubic root of 121243904 is about 494.9408547501.

The spelling of 121243904 in words is "one hundred twenty-one million, two hundred forty-three thousand, nine hundred four".