21321033111 has 112 divisors (see below), whose sum is σ = 37547435520. Its totient is φ = 11850390720.

The previous prime is 21321033109. The next prime is 21321033127. The reversal of 21321033111 is 11133012312.

21321033111 is a `hidden beast` number, since 2 + 1 + 321 + 0 + 331 + 11 = 666.

It is not a de Polignac number, because 21321033111 - 2¹ = 21321033109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321033101) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 30071625 + ... + 30072333.

It is an arithmetic number, because the mean of its divisors is an integer number (335244960).

Almost surely, 2^21321033111 is an apocalyptic number.

21321033111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21321033111 is a deficient number, since it is larger than the sum of its proper divisors (16226402409).

21321033111 is an frugal number, since it uses more digits than its factorization.

21321033111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21321033111 its reverse (11133012312), we get a palindrome (32454045423).

The spelling of 21321033111 in words is "twenty-one billion, three hundred twenty-one million, thirty-three thousand, one hundred eleven".