21212211022229 has 2 divisors, whose sum is σ = 21212211022230. Its totient is φ = 21212211022228.

The previous prime is 21212211022091. The next prime is 21212211022231. The reversal of 21212211022229 is 92222011221212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17532451229329 + 3679759792900 = 4187177^2 + 1918270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212211022229 is a prime.

Together with 21212211022231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212211022259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606105511114 + 10606105511115.

It is an arithmetic number, because the mean of its divisors is an integer number (10606105511115).

Almost surely, 2^{21212211022229} is an apocalyptic number.

It is an amenable number.

21212211022229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212211022229 is an equidigital number, since it uses as much as digits as its factorization.

21212211022229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21212211022229 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, twenty-two thousand, two hundred twenty-nine".