121191240 has 32 divisors (see below), whose sum is σ = 363574080. Its totient is φ = 32317632.

The previous prime is 121191227. The next prime is 121191263. The reversal of 121191240 is 42191121.

It is a happy 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, 504844 + ... + 505083.

It is an arithmetic number, because the mean of its divisors is an integer number (11361690).

Almost surely, 2^121191240 is an apocalyptic number.

121191240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121191240 is an abundant number, since it is smaller than the sum of its proper divisors (242382840).

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

121191240 is a wasteful number, since it uses less digits than its factorization.

121191240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009941 (or 1009937 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 121191240 is about 11008.6892952794. The cubic root of 121191240 is about 494.8691828579.

The spelling of 121191240 in words is "one hundred twenty-one million, one hundred ninety-one thousand, two hundred forty".