21310011271 has 2 divisors, whose sum is σ = 21310011272. Its totient is φ = 21310011270.

The previous prime is 21310011269. The next prime is 21310011329. The reversal of 21310011271 is 17211001312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21310011271 - 2¹ = 21310011269 is a prime.

Together with 21310011269, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310011871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655005635 + 10655005636.

It is an arithmetic number, because the mean of its divisors is an integer number (10655005636).

Almost surely, 2^21310011271 is an apocalyptic number.

21310011271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310011271 is an equidigital number, since it uses as much as digits as its factorization.

21310011271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 19.

Adding to 21310011271 its reverse (17211001312), we get a palindrome (38521012583).

The spelling of 21310011271 in words is "twenty-one billion, three hundred ten million, eleven thousand, two hundred seventy-one".