21022002271 has 2 divisors, whose sum is σ = 21022002272. Its totient is φ = 21022002270.

The previous prime is 21022002181. The next prime is 21022002319. The reversal of 21022002271 is 17220022012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21022002271 - 2⁷ = 21022002143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022002871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511001135 + 10511001136.

It is an arithmetic number, because the mean of its divisors is an integer number (10511001136).

Almost surely, 2^21022002271 is an apocalyptic number.

21022002271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022002271 is an equidigital number, since it uses as much as digits as its factorization.

21022002271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

Adding to 21022002271 its reverse (17220022012), we get a palindrome (38242024283).

The spelling of 21022002271 in words is "twenty-one billion, twenty-two million, two thousand, two hundred seventy-one".