21231101333 has 8 divisors (see below), whose sum is σ = 22894477368. Its totient is φ = 19572041664.

The previous prime is 21231101293. The next prime is 21231101351. The reversal of 21231101333 is 33310113212.

It can be written as a sum of positive squares in 4 ways, for example, as 3005561329 + 18225540004 = 54823^2 + 135002^2 .

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 21231101333 - 2²⁸ = 20962665877 is a prime.

It is a super-2 number, since 2×21231101333² (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 (21231101383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1068866 + ... + 1088547.

It is an arithmetic number, because the mean of its divisors is an integer number (2861809671).

Almost surely, 2^21231101333 is an apocalyptic number.

It is an amenable number.

21231101333 is a deficient number, since it is larger than the sum of its proper divisors (1663376035).

21231101333 is a wasteful number, since it uses less digits than its factorization.

21231101333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158183.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21231101333 its reverse (33310113212), we get a palindrome (54541214545).

The spelling of 21231101333 in words is "twenty-one billion, two hundred thirty-one million, one hundred one thousand, three hundred thirty-three".