121000000 has 147 divisors (see below), whose sum is σ = 329898121.
Its totient is φ = 44000000.
The previous prime is 120999997. The next prime is 121000003. The reversal of 121000000 is 121.
Adding to 121000000 its reverse (121), we get a palindrome (121000121).
Multipling 121000000 by its reverse (121), we get a square (14641000000 = 1210002).
121000000 divided by its reverse (121) gives a 6-th power (1000000 = 106).
The square root of 121000000 is 11000.
It is a perfect power (a square), and thus also a powerful number.
It is an interprime number because it is at equal distance from previous prime (120999997) and next prime (121000003).
It can be written as a sum of positive squares in 3 ways, for example, as 106007616 + 14992384 = 10296^2 + 3872^2
It is a Harshad number since it is a multiple of its sum of digits (4).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (121000003) by changing a digit.
It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 10999995 + ... + 11000005.
Almost surely, 2121000000 is an apocalyptic number.
121000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
121000000 is the 11000-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 121000000
121000000 is an abundant number, since it is smaller than the sum of its proper divisors (208898121).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121000000 is an frugal number, since it uses more digits than its factorization.
121000000 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 64 (or 18 counting only the distinct ones).
The product of its (nonzero) digits is 2, while the sum is 4.
The cubic root of 121000000 is about 494.6087443249.
The spelling of 121000000 in words is "one hundred twenty-one million", and thus it is an aban number.