21220311342229 has 2 divisors, whose sum is σ = 21220311342230. Its totient is φ = 21220311342228.

The previous prime is 21220311342227. The next prime is 21220311342257. The reversal of 21220311342229 is 92224311302212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16134280562500 + 5086030779729 = 4016750^2 + 2255223^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220311342229 - 2¹ = 21220311342227 is a prime.

It is a super-2 number, since 2×21220311342229² (a number of 27 digits) contains 22 as substring.

Together with 21220311342227, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21220311342194 and 21220311342203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220311342221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610155671114 + 10610155671115.

It is an arithmetic number, because the mean of its divisors is an integer number (10610155671115).

Almost surely, 2^{21220311342229} is an apocalyptic number.

It is an amenable number.

21220311342229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220311342229 is an equidigital number, since it uses as much as digits as its factorization.

21220311342229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21220311342229 in words is "twenty-one trillion, two hundred twenty billion, three hundred eleven million, three hundred forty-two thousand, two hundred twenty-nine".