121988281 has 2 divisors, whose sum is σ = 121988282. Its totient is φ = 121988280.

The previous prime is 121988263. The next prime is 121988299. The reversal of 121988281 is 182889121.

It is a balanced prime because it is at equal distance from previous prime (121988263) and next prime (121988299).

It can be written as a sum of positive squares in only one way, i.e., 114832656 + 7155625 = 10716^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 121988281 - 2⁵ = 121988249 is a prime.

It is a super-2 number, since 2×121988281² = 29762281402669922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121988221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60994140 + 60994141.

It is an arithmetic number, because the mean of its divisors is an integer number (60994141).

Almost surely, 2^121988281 is an apocalyptic number.

It is an amenable number.

121988281 is a deficient number, since it is larger than the sum of its proper divisors (1).

121988281 is an equidigital number, since it uses as much as digits as its factorization.

121988281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 40.

The square root of 121988281 is about 11044.8305102432. The cubic root of 121988281 is about 495.9516854279.

The spelling of 121988281 in words is "one hundred twenty-one million, nine hundred eighty-eight thousand, two hundred eighty-one".