21223201133171 has 2 divisors, whose sum is σ = 21223201133172. Its totient is φ = 21223201133170.

The previous prime is 21223201133131. The next prime is 21223201133203. The reversal of 21223201133171 is 17133110232212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223201133171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21223201133131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611600566585 + 10611600566586.

It is an arithmetic number, because the mean of its divisors is an integer number (10611600566586).

Almost surely, 2^{21223201133171} is an apocalyptic number.

21223201133171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223201133171 is an equidigital number, since it uses as much as digits as its factorization.

21223201133171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

Adding to 21223201133171 its reverse (17133110232212), we get a palindrome (38356311365383).

The spelling of 21223201133171 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred one million, one hundred thirty-three thousand, one hundred seventy-one".