121698281 has 4 divisors (see below), whose sum is σ = 125624064. Its totient is φ = 117772500.

The previous prime is 121698271. The next prime is 121698319. The reversal of 121698281 is 182896121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121698281 - 2²² = 117503977 is a prime.

It is a super-2 number, since 2×121698281² = 29620943196709922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121698271) 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, 1962845 + ... + 1962906.

It is an arithmetic number, because the mean of its divisors is an integer number (31406016).

Almost surely, 2^121698281 is an apocalyptic number.

It is an amenable number.

121698281 is a deficient number, since it is larger than the sum of its proper divisors (3925783).

121698281 is an equidigital number, since it uses as much as digits as its factorization.

121698281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3925782.

The product of its digits is 13824, while the sum is 38.

The square root of 121698281 is about 11031.6943848169. The cubic root of 121698281 is about 495.5583686552.

The spelling of 121698281 in words is "one hundred twenty-one million, six hundred ninety-eight thousand, two hundred eighty-one".