21123332316 has 18 divisors (see below), whose sum is σ = 53395090112. Its totient is φ = 7041110760.

The previous prime is 21123332311. The next prime is 21123332317. The reversal of 21123332316 is 61323332112.

21123332316 is a `hidden beast` number, since 2 + 1 + 12 + 3 + 332 + 316 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21123332316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123332311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293379580 + ... + 293379651.

Almost surely, 2^21123332316 is an apocalyptic number.

It is an amenable number.

21123332316 is an abundant number, since it is smaller than the sum of its proper divisors (32271757796).

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

21123332316 is a wasteful number, since it uses less digits than its factorization.

21123332316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586759241 (or 586759236 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

Adding to 21123332316 its reverse (61323332112), we get a palindrome (82446664428).

The spelling of 21123332316 in words is "twenty-one billion, one hundred twenty-three million, three hundred thirty-two thousand, three hundred sixteen".