121810398 has 8 divisors (see below), whose sum is σ = 243620808. Its totient is φ = 40603464.

The previous prime is 121810393. The next prime is 121810421. The reversal of 121810398 is 893018121.

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

121810398 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121810393) 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, 10150861 + ... + 10150872.

It is an arithmetic number, because the mean of its divisors is an integer number (30452601).

Almost surely, 2^121810398 is an apocalyptic number.

121810398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121810398 is a wasteful number, since it uses less digits than its factorization.

121810398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20301738.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 121810398 is about 11036.7748006381. The cubic root of 121810398 is about 495.7105029987.

The spelling of 121810398 in words is "one hundred twenty-one million, eight hundred ten thousand, three hundred ninety-eight".