121999292718241 has 9 divisors (see below), whose sum is σ = 124650781053649. Its totient is φ = 119403055000804.

The previous prime is 121999292718239. The next prime is 121999292718263. The reversal of 121999292718241 is 142817292999121.

The square root of 121999292718241 is 11045329.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 121999292718241 - 2¹ = 121999292718239 is a prime.

It is a super-2 number, since 2×121999292718241² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121999292718211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 519012960 + ... + 519247966.

Almost surely, 2^{121999292718241} is an apocalyptic number.

121999292718241 is the 11045329-th square number.

121999292718241 is the 5522665-th centered octagonal number.

It is an amenable number.

121999292718241 is a deficient number, since it is larger than the sum of its proper divisors (2651488335408).

121999292718241 is an frugal number, since it uses more digits than its factorization.

121999292718241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470108 (or 235054 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 67.

The spelling of 121999292718241 in words is "one hundred twenty-one trillion, nine hundred ninety-nine billion, two hundred ninety-two million, seven hundred eighteen thousand, two hundred forty-one".