121366261 has 4 divisors (see below), whose sum is σ = 121492224. Its totient is φ = 121240300.

The previous prime is 121366249. The next prime is 121366277. The reversal of 121366261 is 162663121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 162663121 = 1439 ⋅113039.

It is a cyclic number.

It is not a de Polignac number, because 121366261 - 2⁵ = 121366229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121366211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61525 + ... + 63466.

It is an arithmetic number, because the mean of its divisors is an integer number (30373056).

Almost surely, 2^121366261 is an apocalyptic number.

It is an amenable number.

121366261 is a deficient number, since it is larger than the sum of its proper divisors (125963).

121366261 is an equidigital number, since it uses as much as digits as its factorization.

121366261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125962.

The product of its digits is 2592, while the sum is 28.

The square root of 121366261 is about 11016.6356479644. The cubic root of 121366261 is about 495.1072936823.

The spelling of 121366261 in words is "one hundred twenty-one million, three hundred sixty-six thousand, two hundred sixty-one".