21211002271 has 2 divisors, whose sum is σ = 21211002272. Its totient is φ = 21211002270.

The previous prime is 21211002233. The next prime is 21211002313. The reversal of 21211002271 is 17220011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211002271 - 2¹⁵ = 21210969503 is a prime.

It is a super-3 number, since 3×21211002271³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211002871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605501135 + 10605501136.

It is an arithmetic number, because the mean of its divisors is an integer number (10605501136).

Almost surely, 2^21211002271 is an apocalyptic number.

21211002271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211002271 is an equidigital number, since it uses as much as digits as its factorization.

21211002271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 21211002271 its reverse (17220011212), we get a palindrome (38431013483).

The spelling of 21211002271 in words is "twenty-one billion, two hundred eleven million, two thousand, two hundred seventy-one".