21231203331 has 32 divisors (see below), whose sum is σ = 31880927232. Its totient is φ = 12469944960.

The previous prime is 21231203299. The next prime is 21231203333. The reversal of 21231203331 is 13330213212.

It is not a de Polignac number, because 21231203331 - 2⁵ = 21231203299 is a prime.

It is a super-2 number, since 2×21231203331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21231203298 and 21231203307.

It is not an unprimeable number, because it can be changed into a prime (21231203333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387846 + ... + 439188.

It is an arithmetic number, because the mean of its divisors is an integer number (996278976).

Almost surely, 2^21231203331 is an apocalyptic number.

21231203331 is a deficient number, since it is larger than the sum of its proper divisors (10649723901).

21231203331 is a wasteful number, since it uses less digits than its factorization.

21231203331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51843.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21231203331 its reverse (13330213212), we get a palindrome (34561416543).

The spelling of 21231203331 in words is "twenty-one billion, two hundred thirty-one million, two hundred three thousand, three hundred thirty-one".