21211120231 has 16 divisors (see below), whose sum is σ = 26397043200. Its totient is φ = 16630131168.

The previous prime is 21211120207. The next prime is 21211120253. The reversal of 21211120231 is 13202111212.

It is not a de Polignac number, because 21211120231 - 2⁵ = 21211120199 is a prime.

It is a super-2 number, since 2×21211120231² (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 (21211120331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2745835 + ... + 2753548.

It is an arithmetic number, because the mean of its divisors is an integer number (1649815200).

Almost surely, 2^21211120231 is an apocalyptic number.

21211120231 is a deficient number, since it is larger than the sum of its proper divisors (5185922969).

21211120231 is a wasteful number, since it uses less digits than its factorization.

21211120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499438.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21211120231 its reverse (13202111212), we get a palindrome (34413231443).

The spelling of 21211120231 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, two hundred thirty-one".