21111123330 has 192 divisors, whose sum is σ = 62088249600. Its totient is φ = 4929845760.

The previous prime is 21111123281. The next prime is 21111123377. The reversal of 21111123330 is 3332111112.

21111123330 is a `hidden beast` number, since 211 + 1 + 1 + 123 + 330 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23800147 + ... + 23801033.

It is an arithmetic number, because the mean of its divisors is an integer number (323376300).

Almost surely, 2^21111123330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111123330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31044124800).

21111123330 is an abundant number, since it is smaller than the sum of its proper divisors (40977126270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111123330 is a wasteful number, since it uses less digits than its factorization.

21111123330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1766 counting only the distinct ones).

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

Adding to 21111123330 its reverse (3332111112), we get a palindrome (24443234442).

It can be divided in two parts, 21111 and 123330, that added together give a palindrome (144441).

The spelling of 21111123330 in words is "twenty-one billion, one hundred eleven million, one hundred twenty-three thousand, three hundred thirty".