121276117261 has 8 divisors (see below), whose sum is σ = 131803262360. Its totient is φ = 110920145472.

The previous prime is 121276117253. The next prime is 121276117309. The reversal of 121276117261 is 162711672121.

It can be written as a sum of positive squares in 4 ways, for example, as 45689062500 + 75587054761 = 213750^2 + 274931^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121276117261 - 2³ = 121276117253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121276117261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121276117211) 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 7 ways as a sum of consecutive naturals, for example, 42791850 + ... + 42794683.

It is an arithmetic number, because the mean of its divisors is an integer number (16475407795).

Almost surely, 2^121276117261 is an apocalyptic number.

It is an amenable number.

121276117261 is a deficient number, since it is larger than the sum of its proper divisors (10527145099).

121276117261 is a wasteful number, since it uses less digits than its factorization.

121276117261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85586655.

The product of its digits is 14112, while the sum is 37.

Adding to 121276117261 its reverse (162711672121), we get a palindrome (283987789382).

The spelling of 121276117261 in words is "one hundred twenty-one billion, two hundred seventy-six million, one hundred seventeen thousand, two hundred sixty-one".