210021220271 has 2 divisors, whose sum is σ = 210021220272. Its totient is φ = 210021220270.

The previous prime is 210021220237. The next prime is 210021220273. The reversal of 210021220271 is 172022120012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021220271 is a prime.

Together with 210021220273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021220273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010610135 + 105010610136.

It is an arithmetic number, because the mean of its divisors is an integer number (105010610136).

Almost surely, 2^210021220271 is an apocalyptic number.

210021220271 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021220271 is an equidigital number, since it uses as much as digits as its factorization.

210021220271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 210021220271 its reverse (172022120012), we get a palindrome (382043340283).

The spelling of 210021220271 in words is "two hundred ten billion, twenty-one million, two hundred twenty thousand, two hundred seventy-one".