21133231323 has 16 divisors (see below), whose sum is σ = 28270235136. Its totient is φ = 14042602080.

The previous prime is 21133231319. The next prime is 21133231351. The reversal of 21133231323 is 32313233112.

It is not a de Polignac number, because 21133231323 - 2² = 21133231319 is a prime.

It is a super-2 number, since 2×21133231323² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21133231293 and 21133231302.

It is not an unprimeable number, because it can be changed into a prime (21133231373) 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 15 ways as a sum of consecutive naturals, for example, 1150590 + ... + 1168812.

It is an arithmetic number, because the mean of its divisors is an integer number (1766889696).

Almost surely, 2^21133231323 is an apocalyptic number.

21133231323 is a deficient number, since it is larger than the sum of its proper divisors (7137003813).

21133231323 is a wasteful number, since it uses less digits than its factorization.

21133231323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19474.

The product of its digits is 1944, while the sum is 24.

Adding to 21133231323 its reverse (32313233112), we get a palindrome (53446464435).

The spelling of 21133231323 in words is "twenty-one billion, one hundred thirty-three million, two hundred thirty-one thousand, three hundred twenty-three".