21213132323 has 8 divisors (see below), whose sum is σ = 22350352128. Its totient is φ = 20093821704.

The previous prime is 21213132319. The next prime is 21213132349. The reversal of 21213132323 is 32323131212.

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 21213132323 - 2² = 21213132319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213132373) 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 7 ways as a sum of consecutive naturals, for example, 4474865 + ... + 4479602.

It is an arithmetic number, because the mean of its divisors is an integer number (2793794016).

Almost surely, 2^21213132323 is an apocalyptic number.

21213132323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21213132323 is a deficient number, since it is larger than the sum of its proper divisors (1137219805).

21213132323 is a wasteful number, since it uses less digits than its factorization.

21213132323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8954593.

The product of its digits is 1296, while the sum is 23.

Adding to 21213132323 its reverse (32323131212), we get a palindrome (53536263535).

The spelling of 21213132323 in words is "twenty-one billion, two hundred thirteen million, one hundred thirty-two thousand, three hundred twenty-three".