221323204429 has 2 divisors, whose sum is σ = 221323204430. Its totient is φ = 221323204428.

The previous prime is 221323204397. The next prime is 221323204439. The reversal of 221323204429 is 924402323122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178392193225 + 42931011204 = 422365^2 + 207198^2 .

It is a cyclic number.

It is not a de Polignac number, because 221323204429 - 2⁵ = 221323204397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221323204394 and 221323204403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221323204439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661602214 + 110661602215.

It is an arithmetic number, because the mean of its divisors is an integer number (110661602215).

Almost surely, 2^221323204429 is an apocalyptic number.

It is an amenable number.

221323204429 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323204429 is an equidigital number, since it uses as much as digits as its factorization.

221323204429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 221323204429 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred four thousand, four hundred twenty-nine".