21331234331 has 16 divisors (see below), whose sum is σ = 23835651840. Its totient is φ = 18921930720.

The previous prime is 21331234321. The next prime is 21331234349. The reversal of 21331234331 is 13343213312.

It is not a de Polignac number, because 21331234331 - 2¹⁰ = 21331233307 is a prime.

It is a super-2 number, since 2×21331234331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21331234331.

It is not an unprimeable number, because it can be changed into a prime (21331234321) 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, 456890 + ... + 501408.

It is an arithmetic number, because the mean of its divisors is an integer number (1489728240).

Almost surely, 2^21331234331 is an apocalyptic number.

21331234331 is a deficient number, since it is larger than the sum of its proper divisors (2504417509).

21331234331 is a wasteful number, since it uses less digits than its factorization.

21331234331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45586.

The product of its digits is 3888, while the sum is 26.

Adding to 21331234331 its reverse (13343213312), we get a palindrome (34674447643).

The spelling of 21331234331 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty-four thousand, three hundred thirty-one".