21112122330 has 48 divisors (see below), whose sum is σ = 59113945800. Its totient is φ = 5196829824.

The previous prime is 21112122319. The next prime is 21112122331. The reversal of 21112122330 is 3322121112.

21112122330 is a `hidden beast` number, since 211 + 1 + 2 + 122 + 330 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14617535409 + 6494586921 = 120903^2 + 80589^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21112122331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9021105 + ... + 9023444.

Almost surely, 2^21112122330 is an apocalyptic number.

21112122330 is an abundant number, since it is smaller than the sum of its proper divisors (38001823470).

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

21112122330 is a wasteful number, since it uses less digits than its factorization.

21112122330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044575 (or 18044572 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21112122330 its reverse (3322121112), we get a palindrome (24434243442).

The spelling of 21112122330 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, three hundred thirty".