121312250 has 32 divisors (see below), whose sum is σ = 228795840. Its totient is φ = 48162000.

The previous prime is 121312229. The next prime is 121312253. The reversal of 121312250 is 52213121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121312253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33005 + ... + 36495.

It is an arithmetic number, because the mean of its divisors is an integer number (7149870).

Almost surely, 2^121312250 is an apocalyptic number.

121312250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121312250 is a deficient number, since it is larger than the sum of its proper divisors (107483590).

121312250 is a wasteful number, since it uses less digits than its factorization.

121312250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647 (or 3637 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 121312250 is about 11014.1840369589. The cubic root of 121312250 is about 495.0338377712.

Adding to 121312250 its reverse (52213121), we get a palindrome (173525371).

The spelling of 121312250 in words is "one hundred twenty-one million, three hundred twelve thousand, two hundred fifty".