21323133111 has 16 divisors (see below), whose sum is σ = 32534452224. Its totient is φ = 12168875424.

The previous prime is 21323133103. The next prime is 21323133121. The reversal of 21323133111 is 11133132312.

It is a happy number.

It is not a de Polignac number, because 21323133111 - 2³ = 21323133103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323133121) 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, 640551 + ... + 673016.

It is an arithmetic number, because the mean of its divisors is an integer number (2033403264).

Almost surely, 2^21323133111 is an apocalyptic number.

21323133111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21323133111 is a deficient number, since it is larger than the sum of its proper divisors (11211319113).

21323133111 is a wasteful number, since it uses less digits than its factorization.

21323133111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314350.

The product of its digits is 324, while the sum is 21.

Adding to 21323133111 its reverse (11133132312), we get a palindrome (32456265423).

The spelling of 21323133111 in words is "twenty-one billion, three hundred twenty-three million, one hundred thirty-three thousand, one hundred eleven".