121902500 has 30 divisors (see below), whose sum is σ = 266581854. Its totient is φ = 48760000.

The previous prime is 121902497. The next prime is 121902511. The reversal of 121902500 is 5209121.

It can be written as a sum of positive squares in 5 ways, for example, as 15936064 + 105966436 = 3992^2 + 10294^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 21881 + ... + 26880.

Almost surely, 2^121902500 is an apocalyptic number.

121902500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121902500 is an abundant number, since it is smaller than the sum of its proper divisors (144679354).

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

121902500 is an equidigital number, since it uses as much as digits as its factorization.

121902500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48785 (or 48768 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 121902500 is about 11040.9465173961. The cubic root of 121902500 is about 495.8354086646.

It can be divided in two parts, 121 and 902500, that multiplied together give a square (109202500 = 10450²).

The spelling of 121902500 in words is "one hundred twenty-one million, nine hundred two thousand, five hundred".