21220234231 has 8 divisors (see below), whose sum is σ = 24287209344. Its totient is φ = 18162137400.

The previous prime is 21220234213. The next prime is 21220234267. The reversal of 21220234231 is 13243202212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21220234231 - 2⁵ = 21220234199 is a prime.

It is a super-2 number, since 2×21220234231² (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 (21220234271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214445 + ... + 2224006.

It is an arithmetic number, because the mean of its divisors is an integer number (3035901168).

Almost surely, 2^21220234231 is an apocalyptic number.

21220234231 is a deficient number, since it is larger than the sum of its proper divisors (3066975113).

21220234231 is an equidigital number, since it uses as much as digits as its factorization.

21220234231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439141.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21220234231 its reverse (13243202212), we get a palindrome (34463436443).

The spelling of 21220234231 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-four thousand, two hundred thirty-one".