121400250 has 64 divisors (see below), whose sum is σ = 305240832. Its totient is φ = 32136000.

The previous prime is 121400239. The next prime is 121400261. The reversal of 121400250 is 52004121.

It is an interprime number because it is at equal distance from previous prime (121400239) and next prime (121400261).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 117235 + ... + 118265.

It is an arithmetic number, because the mean of its divisors is an integer number (4769388).

Almost surely, 2^121400250 is an apocalyptic number.

121400250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121400250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152620416).

121400250 is an abundant number, since it is smaller than the sum of its proper divisors (183840582).

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

121400250 is a wasteful number, since it uses less digits than its factorization.

121400250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 121400250 is about 11018.1781615655. The cubic root of 121400250 is about 495.1535081491.

Adding to 121400250 its reverse (52004121), we get a palindrome (173404371).

The spelling of 121400250 in words is "one hundred twenty-one million, four hundred thousand, two hundred fifty".