12212021291 has 2 divisors, whose sum is σ = 12212021292. Its totient is φ = 12212021290.

The previous prime is 12212021287. The next prime is 12212021293. The reversal of 12212021291 is 19212021221.

It is a strong prime.

It is an emirp because it is prime and its reverse (19212021221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12212021291 - 2² = 12212021287 is a prime.

Together with 12212021293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12212021293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106010645 + 6106010646.

It is an arithmetic number, because the mean of its divisors is an integer number (6106010646).

Almost surely, 2^12212021291 is an apocalyptic number.

12212021291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212021291 is an equidigital number, since it uses as much as digits as its factorization.

12212021291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 12212021291 in words is "twelve billion, two hundred twelve million, twenty-one thousand, two hundred ninety-one".