21211322231 has 32 divisors (see below), whose sum is σ = 24432814080. Its totient is φ = 18236649600.

The previous prime is 21211322203. The next prime is 21211322273. The reversal of 21211322231 is 13222311212.

It is a cyclic number.

It is not a de Polignac number, because 21211322231 - 2¹⁰ = 21211321207 is a prime.

It is a super-2 number, since 2×21211322231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211322731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4859456 + ... + 4863818.

It is an arithmetic number, because the mean of its divisors is an integer number (763525440).

Almost surely, 2^21211322231 is an apocalyptic number.

21211322231 is a deficient number, since it is larger than the sum of its proper divisors (3221491849).

21211322231 is a wasteful number, since it uses less digits than its factorization.

21211322231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4727.

The product of its digits is 288, while the sum is 20.

Adding to 21211322231 its reverse (13222311212), we get a palindrome (34433633443).

The spelling of 21211322231 in words is "twenty-one billion, two hundred eleven million, three hundred twenty-two thousand, two hundred thirty-one".