21303032331 has 16 divisors (see below), whose sum is σ = 33873145344. Its totient is φ = 11643893184.

The previous prime is 21303032293. The next prime is 21303032341. The reversal of 21303032331 is 13323030312.

It is not a de Polignac number, because 21303032331 - 2¹⁵ = 21302999563 is a prime.

It is a super-2 number, since 2×21303032331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21303032298 and 21303032307.

It is not an unprimeable number, because it can be changed into a prime (21303032341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22052346 + ... + 22053311.

It is an arithmetic number, because the mean of its divisors is an integer number (2117071584).

Almost surely, 2^21303032331 is an apocalyptic number.

21303032331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21303032331 is a deficient number, since it is larger than the sum of its proper divisors (12570113013).

21303032331 is a wasteful number, since it uses less digits than its factorization.

21303032331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44105690.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21303032331 its reverse (13323030312), we get a palindrome (34626062643).

The spelling of 21303032331 in words is "twenty-one billion, three hundred three million, thirty-two thousand, three hundred thirty-one".