21271441211 has 4 divisors (see below), whose sum is σ = 21620153424. Its totient is φ = 20922729000.

The previous prime is 21271441207. The next prime is 21271441231. The reversal of 21271441211 is 11214417212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21271441211 - 2² = 21271441207 is a prime.

It is a super-2 number, since 2×21271441211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21271441231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174356015 + ... + 174356136.

It is an arithmetic number, because the mean of its divisors is an integer number (5405038356).

Almost surely, 2^21271441211 is an apocalyptic number.

21271441211 is a deficient number, since it is larger than the sum of its proper divisors (348712213).

21271441211 is an equidigital number, since it uses as much as digits as its factorization.

21271441211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348712212.

The product of its digits is 896, while the sum is 26.

Adding to 21271441211 its reverse (11214417212), we get a palindrome (32485858423).

The spelling of 21271441211 in words is "twenty-one billion, two hundred seventy-one million, four hundred forty-one thousand, two hundred eleven".