20221233281 has 2 divisors, whose sum is σ = 20221233282. Its totient is φ = 20221233280.

The previous prime is 20221233223. The next prime is 20221233283. The reversal of 20221233281 is 18233212202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18330722881 + 1890510400 = 135391^2 + 43480^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221233281 - 2¹⁰ = 20221232257 is a prime.

It is a super-2 number, since 2×20221233281² (a number of 21 digits) contains 22 as substring.

Together with 20221233283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20221233281.

It is not a weakly prime, because it can be changed into another prime (20221233283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110616640 + 10110616641.

It is an arithmetic number, because the mean of its divisors is an integer number (10110616641).

Almost surely, 2^20221233281 is an apocalyptic number.

It is an amenable number.

20221233281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221233281 is an equidigital number, since it uses as much as digits as its factorization.

20221233281 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 26.

Adding to 20221233281 its reverse (18233212202), we get a palindrome (38454445483).

The spelling of 20221233281 in words is "twenty billion, two hundred twenty-one million, two hundred thirty-three thousand, two hundred eighty-one".