121855988 has 6 divisors (see below), whose sum is σ = 213247986. Its totient is φ = 60927992.

The previous prime is 121855967. The next prime is 121855991. The reversal of 121855988 is 889558121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 110418064 + 11437924 = 10508^2 + 3382^2 .

It is a super-2 number, since 2×121855988² = 29697763622912288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15231995 + ... + 15232002.

It is an arithmetic number, because the mean of its divisors is an integer number (35541331).

Almost surely, 2^121855988 is an apocalyptic number.

It is an amenable number.

121855988 is a deficient number, since it is larger than the sum of its proper divisors (91391998).

121855988 is a wasteful number, since it uses less digits than its factorization.

121855988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30464001 (or 30463999 counting only the distinct ones).

The product of its digits is 230400, while the sum is 47.

The square root of 121855988 is about 11038.8399752873. The cubic root of 121855988 is about 495.7723385052.

The spelling of 121855988 in words is "one hundred twenty-one million, eight hundred fifty-five thousand, nine hundred eighty-eight".