121398825 has 24 divisors (see below), whose sum is σ = 201603168.
Its totient is φ = 64458880.
The previous prime is 121398817. The next prime is 121398839. The reversal of 121398825 is 528893121.
It is not a de Polignac number, because 121398825 - 23 = 121398817 is a prime.
It is a super-2 number, since 2×1213988252 = 29475349422761250, which contains 22 as substring.
It is a house number.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14002 + ... + 20948.
It is an arithmetic number, because the mean of its divisors is an integer number (8400132).
Almost surely, 2121398825 is an apocalyptic number.
121398825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
121398825 is a deficient number, since it is larger than the sum of its proper divisors (80204343).
121398825 is a wasteful number, since it uses less digits than its factorization.
121398825 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7193 (or 7188 counting only the distinct ones).
The product of its digits is 34560, while the sum is 39.
The square root of 121398825 is about 11018.1134955127.
The cubic root of 121398825 is about 495.1515707657.
The spelling of 121398825 in words is "one hundred twenty-one million, three hundred ninety-eight thousand, eight hundred twenty-five".