21113324028 has 48 divisors (see below), whose sum is σ = 54748985760. Its totient is φ = 7036394112.

The previous prime is 21113324021. The next prime is 21113324033. The reversal of 21113324028 is 82042331112.

21113324028 is a `hidden beast` number, since 211 + 13 + 32 + 402 + 8 = 666.

It is a super-2 number, since 2×21113324028² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21113323992 and 21113324010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113324021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637576 + ... + 669872.

It is an arithmetic number, because the mean of its divisors is an integer number (1140603870).

Almost surely, 2^21113324028 is an apocalyptic number.

It is an amenable number.

21113324028 is an abundant number, since it is smaller than the sum of its proper divisors (33635661732).

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

21113324028 is a wasteful number, since it uses less digits than its factorization.

21113324028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38363 (or 38355 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The spelling of 21113324028 in words is "twenty-one billion, one hundred thirteen million, three hundred twenty-four thousand, twenty-eight".