21120323020 has 24 divisors (see below), whose sum is σ = 44414395200. Its totient is φ = 8436373632.

The previous prime is 21120322991. The next prime is 21120323047. The reversal of 21120323020 is 2032302112.

It is a junction number, because it is equal to n+sod(n) for n = 21120322985 and 21120323003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719985 + ... + 748744.

It is an arithmetic number, because the mean of its divisors is an integer number (1850599800).

Almost surely, 2^21120323020 is an apocalyptic number.

21120323020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120323020 is an abundant number, since it is smaller than the sum of its proper divisors (23294072180).

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

21120323020 is a wasteful number, since it uses less digits than its factorization.

21120323020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469457 (or 1469455 counting only the distinct ones).

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

Adding to 21120323020 its reverse (2032302112), we get a palindrome (23152625132).

The spelling of 21120323020 in words is "twenty-one billion, one hundred twenty million, three hundred twenty-three thousand, twenty".