221423221633 has 2 divisors, whose sum is σ = 221423221634. Its totient is φ = 221423221632.

The previous prime is 221423221609. The next prime is 221423221651. The reversal of 221423221633 is 336122324122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219953496064 + 1469725569 = 468992^2 + 38337^2 .

It is a cyclic number.

It is not a de Polignac number, because 221423221633 - 2²⁵ = 221389667201 is a prime.

It is a super-3 number, since 3×221423221633³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221423221595 and 221423221604.

It is not a weakly prime, because it can be changed into another prime (221423221673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110711610816 + 110711610817.

It is an arithmetic number, because the mean of its divisors is an integer number (110711610817).

Almost surely, 2^221423221633 is an apocalyptic number.

It is an amenable number.

221423221633 is a deficient number, since it is larger than the sum of its proper divisors (1).

221423221633 is an equidigital number, since it uses as much as digits as its factorization.

221423221633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 31.

Adding to 221423221633 its reverse (336122324122), we get a palindrome (557545545755).

The spelling of 221423221633 in words is "two hundred twenty-one billion, four hundred twenty-three million, two hundred twenty-one thousand, six hundred thirty-three".