21122221311 has 32 divisors (see below), whose sum is σ = 32403283200. Its totient is φ = 13582447200.

The previous prime is 21122221249. The next prime is 21122221403. The reversal of 21122221311 is 11312222112.

It is not a de Polignac number, because 21122221311 - 2¹¹ = 21122219263 is a prime.

It is a super-2 number, since 2×21122221311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122201311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 810100 + ... + 835766.

It is an arithmetic number, because the mean of its divisors is an integer number (1012602600).

Almost surely, 2^21122221311 is an apocalyptic number.

21122221311 is a deficient number, since it is larger than the sum of its proper divisors (11281061889).

21122221311 is a wasteful number, since it uses less digits than its factorization.

21122221311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26756 (or 26750 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 21122221311 its reverse (11312222112), we get a palindrome (32434443423).

The spelling of 21122221311 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, three hundred eleven".