121888090 has 8 divisors (see below), whose sum is σ = 219398580. Its totient is φ = 48755232.

The previous prime is 121888057. The next prime is 121888099. The reversal of 121888090 is 90888121.

It can be written as a sum of positive squares in 2 ways, for example, as 120758121 + 1129969 = 10989^2 + 1063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (121888099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6094395 + ... + 6094414.

Almost surely, 2^121888090 is an apocalyptic number.

121888090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121888090 is a deficient number, since it is larger than the sum of its proper divisors (97510490).

121888090 is a wasteful number, since it uses less digits than its factorization.

121888090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12188816.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 121888090 is about 11040.2939272467. The cubic root of 121888090 is about 495.8158704550.

The spelling of 121888090 in words is "one hundred twenty-one million, eight hundred eighty-eight thousand, ninety".