12209213381 has 2 divisors, whose sum is σ = 12209213382. Its totient is φ = 12209213380.

The previous prime is 12209213351. The next prime is 12209213437. The reversal of 12209213381 is 18331290221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11354820481 + 854392900 = 106559^2 + 29230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12209213381 is a prime.

It is a super-2 number, since 2×12209213381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12209213311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6104606690 + 6104606691.

It is an arithmetic number, because the mean of its divisors is an integer number (6104606691).

Almost surely, 2^12209213381 is an apocalyptic number.

It is an amenable number.

12209213381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12209213381 is an equidigital number, since it uses as much as digits as its factorization.

12209213381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 12209213381 in words is "twelve billion, two hundred nine million, two hundred thirteen thousand, three hundred eighty-one".