21323002120 has 64 divisors (see below), whose sum is σ = 55491246720. Its totient is φ = 7222654464.

The previous prime is 21323002109. The next prime is 21323002123. The reversal of 21323002120 is 2120032312.

It is a junction number, because it is equal to n+sod(n) for n = 21323002094 and 21323002103.

It is not an unprimeable number, because it can be changed into a prime (21323002123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435517 + ... + 481996.

It is an arithmetic number, because the mean of its divisors is an integer number (867050730).

Almost surely, 2^21323002120 is an apocalyptic number.

21323002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323002120 is an abundant number, since it is smaller than the sum of its proper divisors (34168244600).

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

21323002120 is a wasteful number, since it uses less digits than its factorization.

21323002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917614 (or 917610 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21323002120 its reverse (2120032312), we get a palindrome (23443034432).

The spelling of 21323002120 in words is "twenty-one billion, three hundred twenty-three million, two thousand, one hundred twenty".