121988 has 6 divisors (see below), whose sum is σ = 213486. Its totient is φ = 60992.

The previous prime is 121967. The next prime is 121993. The reversal of 121988 is 889121.

121988 is nontrivially palindromic in base 6.

It can be written as a sum of positive squares in only one way, i.e., 114244 + 7744 = 338^2 + 88^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121988.

It is an unprimeable number.

121988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15245 + ... + 15252.

It is an arithmetic number, because the mean of its divisors is an integer number (35581).

2¹²¹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

121988 is a deficient number, since it is larger than the sum of its proper divisors (91498).

121988 is a wasteful number, since it uses less digits than its factorization.

121988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30501 (or 30499 counting only the distinct ones).

The product of its digits is 1152, while the sum is 29.

The square root of 121988 is about 349.2678055590. The cubic root of 121988 is about 49.5951304619.

The spelling of 121988 in words is "one hundred twenty-one thousand, nine hundred eighty-eight".