121281140 has 24 divisors (see below), whose sum is σ = 254994432. Its totient is φ = 48454560.

The previous prime is 121281133. The next prime is 121281151. The reversal of 121281140 is 41182121.

It is a super-2 number, since 2×121281140² = 29418229839399200, which contains 22 as substring.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16205 + ... + 22475.

It is an arithmetic number, because the mean of its divisors is an integer number (10624768).

Almost surely, 2^121281140 is an apocalyptic number.

121281140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121281140 is an abundant number, since it is smaller than the sum of its proper divisors (133713292).

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

121281140 is a wasteful number, since it uses less digits than its factorization.

121281140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247 (or 7245 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 121281140 is about 11012.7716765581. The cubic root of 121281140 is about 494.9915177270.

The spelling of 121281140 in words is "one hundred twenty-one million, two hundred eighty-one thousand, one hundred forty".