21212211299 has 2 divisors, whose sum is σ = 21212211300. Its totient is φ = 21212211298.

The previous prime is 21212211263. The next prime is 21212211331. The reversal of 21212211299 is 99211221212.

It is an a-pointer prime, because the next prime (21212211331) can be obtained adding 21212211299 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212211299 - 2²⁰ = 21211162723 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212214299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606105649 + 10606105650.

It is an arithmetic number, because the mean of its divisors is an integer number (10606105650).

Almost surely, 2^21212211299 is an apocalyptic number.

21212211299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212211299 is an equidigital number, since it uses as much as digits as its factorization.

21212211299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The spelling of 21212211299 in words is "twenty-one billion, two hundred twelve million, two hundred eleven thousand, two hundred ninety-nine".