21303223231 has 8 divisors (see below), whose sum is σ = 22230968544. Its totient is φ = 20375604480.

The previous prime is 21303223217. The next prime is 21303223247. The reversal of 21303223231 is 13232230312.

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 21303223231 - 2¹³ = 21303215039 is a prime.

It is a super-2 number, since 2×21303223231² (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 (21303221231) 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, 509271 + ... + 549511.

It is an arithmetic number, because the mean of its divisors is an integer number (2778871068).

Almost surely, 2^21303223231 is an apocalyptic number.

21303223231 is a deficient number, since it is larger than the sum of its proper divisors (927745313).

21303223231 is a wasteful number, since it uses less digits than its factorization.

21303223231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63281.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21303223231 its reverse (13232230312), we get a palindrome (34535453543).

The spelling of 21303223231 in words is "twenty-one billion, three hundred three million, two hundred twenty-three thousand, two hundred thirty-one".