21233312131 has 8 divisors (see below), whose sum is σ = 21267511200. Its totient is φ = 21199142400.

The previous prime is 21233312129. The next prime is 21233312141. The reversal of 21233312131 is 13121333212.

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 21233312131 - 2¹ = 21233312129 is a prime.

It is a super-2 number, since 2×21233312131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233312141) 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, 1769530 + ... + 1781488.

It is an arithmetic number, because the mean of its divisors is an integer number (2658438900).

Almost surely, 2^21233312131 is an apocalyptic number.

21233312131 is a deficient number, since it is larger than the sum of its proper divisors (34199069).

21233312131 is a wasteful number, since it uses less digits than its factorization.

21233312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14669.

The product of its digits is 648, while the sum is 22.

Adding to 21233312131 its reverse (13121333212), we get a palindrome (34354645343).

The spelling of 21233312131 in words is "twenty-one billion, two hundred thirty-three million, three hundred twelve thousand, one hundred thirty-one".