20221273447 has 2 divisors, whose sum is σ = 20221273448. Its totient is φ = 20221273446.

The previous prime is 20221273403. The next prime is 20221273451. The reversal of 20221273447 is 74437212202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221273447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221273487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110636723 + 10110636724.

It is an arithmetic number, because the mean of its divisors is an integer number (10110636724).

Almost surely, 2^20221273447 is an apocalyptic number.

20221273447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221273447 is an equidigital number, since it uses as much as digits as its factorization.

20221273447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 34.

Adding to 20221273447 its reverse (74437212202), we get a palindrome (94658485649).

The spelling of 20221273447 in words is "twenty billion, two hundred twenty-one million, two hundred seventy-three thousand, four hundred forty-seven".