12209213081 has 4 divisors (see below), whose sum is σ = 13148383332. Its totient is φ = 11270042832.

The previous prime is 12209213053. The next prime is 12209213111. The reversal of 12209213081 is 18031290221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4943355481 + 7265857600 = 70309^2 + 85240^2 .

It is a cyclic number.

It is not a de Polignac number, because 12209213081 - 2²⁶ = 12142104217 is a prime.

It is a super-2 number, since 2×12209213081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12209213381) 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, 469585106 + ... + 469585131.

It is an arithmetic number, because the mean of its divisors is an integer number (3287095833).

Almost surely, 2^12209213081 is an apocalyptic number.

It is an amenable number.

12209213081 is a deficient number, since it is larger than the sum of its proper divisors (939170251).

12209213081 is an equidigital number, since it uses as much as digits as its factorization.

12209213081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939170250.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 12209213081 in words is "twelve billion, two hundred nine million, two hundred thirteen thousand, eighty-one".