21312333111 has 8 divisors (see below), whose sum is σ = 29184456304. Its totient is φ = 13824216000.

The previous prime is 21312333089. The next prime is 21312333139. The reversal of 21312333111 is 11133321312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21312333111 - 2⁶ = 21312333047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312333311) 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, 96001390 + ... + 96001611.

It is an arithmetic number, because the mean of its divisors is an integer number (3648057038).

Almost surely, 2^21312333111 is an apocalyptic number.

21312333111 is a deficient number, since it is larger than the sum of its proper divisors (7872123193).

21312333111 is a wasteful number, since it uses less digits than its factorization.

21312333111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192003041.

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

Adding to 21312333111 its reverse (11133321312), we get a palindrome (32445654423).

The spelling of 21312333111 in words is "twenty-one billion, three hundred twelve million, three hundred thirty-three thousand, one hundred eleven".