121017261 has 16 divisors (see below), whose sum is σ = 167319360. Its totient is φ = 77710080.

The previous prime is 121017257. The next prime is 121017301. The reversal of 121017261 is 162710121.

It is a happy number.

It is not a de Polignac number, because 121017261 - 2² = 121017257 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121017161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41301 + ... + 44133.

It is an arithmetic number, because the mean of its divisors is an integer number (10457460).

It is a Poulet number, since it divides 2^121017260-1.

Almost surely, 2^121017261 is an apocalyptic number.

It is an amenable number.

121017261 is a deficient number, since it is larger than the sum of its proper divisors (46302099).

121017261 is a wasteful number, since it uses less digits than its factorization.

121017261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 121017261 is about 11000.7845629300. The cubic root of 121017261 is about 494.6322623293.

Adding to 121017261 its reverse (162710121), we get a palindrome (283727382).

It can be divided in two parts, 121017 and 261, that added together give a triangular number (121278 = T₄₉₂).

The spelling of 121017261 in words is "one hundred twenty-one million, seventeen thousand, two hundred sixty-one".