21120030324 has 72 divisors (see below), whose sum is σ = 56413244160. Its totient is φ = 6648662592.

The previous prime is 21120030313. The next prime is 21120030341. The reversal of 21120030324 is 42303002112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21120030297 and 21120030306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96027 + ... + 226850.

It is an arithmetic number, because the mean of its divisors is an integer number (783517280).

Almost surely, 2^21120030324 is an apocalyptic number.

It is an amenable number.

21120030324 is an abundant number, since it is smaller than the sum of its proper divisors (35293213836).

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

21120030324 is a wasteful number, since it uses less digits than its factorization.

21120030324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322989 (or 322984 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21120030324 its reverse (42303002112), we get a palindrome (63423032436).

The spelling of 21120030324 in words is "twenty-one billion, one hundred twenty million, thirty thousand, three hundred twenty-four".