121075720 has 16 divisors (see below), whose sum is σ = 272420460. Its totient is φ = 48430272.

The previous prime is 121075699. The next prime is 121075723. The reversal of 121075720 is 27570121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 120956004 + 119716 = 10998^2 + 346^2 .

It is not an unprimeable number, because it can be changed into a prime (121075723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1513407 + ... + 1513486.

Almost surely, 2^121075720 is an apocalyptic number.

121075720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121075720 is an abundant number, since it is smaller than the sum of its proper divisors (151344740).

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

121075720 is a wasteful number, since it uses less digits than its factorization.

121075720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026904 (or 3026900 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 121075720 is about 11003.4412798906. The cubic root of 121075720 is about 494.7118957424.

The spelling of 121075720 in words is "one hundred twenty-one million, seventy-five thousand, seven hundred twenty".