121021998 has 16 divisors (see below), whose sum is σ = 252567936. Its totient is φ = 38586680.

The previous prime is 121021981. The next prime is 121022009. The reversal of 121021998 is 899120121.

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, 438348 + ... + 438623.

It is an arithmetic number, because the mean of its divisors is an integer number (15785496).

Almost surely, 2^121021998 is an apocalyptic number.

121021998 is an abundant number, since it is smaller than the sum of its proper divisors (131545938).

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

121021998 is a wasteful number, since it uses less digits than its factorization.

121021998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876999.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 121021998 is about 11000.9998636488. Note that the first 3 decimals coincide. The cubic root of 121021998 is about 494.6387160711.

The spelling of 121021998 in words is "one hundred twenty-one million, twenty-one thousand, nine hundred ninety-eight".