21113344233 has 12 divisors (see below), whose sum is σ = 30498590980. Its totient is φ = 14074852896.

The previous prime is 21113344181. The next prime is 21113344249. The reversal of 21113344233 is 33244331112.

It is a happy number.

21113344233 is a `hidden beast` number, since 211 + 1 + 3 + 3 + 442 + 3 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13215111849 + 7898232384 = 114957^2 + 88872^2 .

It is not a de Polignac number, because 21113344233 - 2⁹ = 21113343721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113344197 and 21113344206.

It is not an unprimeable number, because it can be changed into a prime (21113344333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180135 + ... + 273267.

Almost surely, 2^21113344233 is an apocalyptic number.

It is an amenable number.

21113344233 is a deficient number, since it is larger than the sum of its proper divisors (9385246747).

21113344233 is a wasteful number, since it uses less digits than its factorization.

21113344233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118328 (or 118325 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21113344233 its reverse (33244331112), we get a palindrome (54357675345).

The spelling of 21113344233 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-four thousand, two hundred thirty-three".