11721280097 has 4 divisors (see below), whose sum is σ = 11769916356. Its totient is φ = 11672643840.

The previous prime is 11721280091. The next prime is 11721280111. The reversal of 11721280097 is 79008212711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79008212711 = 449 ⋅175964839.

It can be written as a sum of positive squares in 2 ways, for example, as 8339159761 + 3382120336 = 91319^2 + 58156^2 .

It is a cyclic number.

It is not a de Polignac number, because 11721280097 - 2²⁶ = 11654171233 is a prime.

It is a super-2 number, since 2×11721280097² (a number of 21 digits) contains 22 as substring.

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 11721280097.

It is not an unprimeable number, because it can be changed into a prime (11721280091) 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, 24317768 + ... + 24318249.

It is an arithmetic number, because the mean of its divisors is an integer number (2942479089).

Almost surely, 2^11721280097 is an apocalyptic number.

It is an amenable number.

11721280097 is a deficient number, since it is larger than the sum of its proper divisors (48636259).

11721280097 is an equidigital number, since it uses as much as digits as its factorization.

11721280097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48636258.

The product of its (nonzero) digits is 14112, while the sum is 38.

The spelling of 11721280097 in words is "eleven billion, seven hundred twenty-one million, two hundred eighty thousand, ninety-seven".