121355140 has 24 divisors (see below), whose sum is σ = 263634840. Its totient is φ = 46867968.

The previous prime is 121355093. The next prime is 121355141. The reversal of 121355140 is 41553121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10810944 + 110544196 = 3288^2 + 10514^2 .

It is not an unprimeable number, because it can be changed into a prime (121355141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104037 + ... + 105196.

It is an arithmetic number, because the mean of its divisors is an integer number (10984785).

Almost surely, 2^121355140 is an apocalyptic number.

121355140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121355140 is an abundant number, since it is smaller than the sum of its proper divisors (142279700).

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

121355140 is a wasteful number, since it uses less digits than its factorization.

121355140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209271 (or 209269 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 121355140 is about 11016.1308997306. The cubic root of 121355140 is about 495.0921707084.

The spelling of 121355140 in words is "one hundred twenty-one million, three hundred fifty-five thousand, one hundred forty".