21203302120 has 256 divisors, whose sum is σ = 64446036480. Its totient is φ = 6063206400.

The previous prime is 21203302079. The next prime is 21203302129. The reversal of 21203302120 is 2120330212.

It is a junction number, because it is equal to n+sod(n) for n = 21203302094 and 21203302103.

It is not an unprimeable number, because it can be changed into a prime (21203302129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6925390 + ... + 6928450.

It is an arithmetic number, because the mean of its divisors is an integer number (251742330).

Almost surely, 2^21203302120 is an apocalyptic number.

21203302120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203302120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32223018240).

21203302120 is an abundant number, since it is smaller than the sum of its proper divisors (43242734360).

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

21203302120 is a wasteful number, since it uses less digits than its factorization.

21203302120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276 (or 3272 counting only the distinct ones).

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

Adding to 21203302120 its reverse (2120330212), we get a palindrome (23323632332).

It can be divided in two parts, 21203 and 302120, that added together give a palindrome (323323).

The spelling of 21203302120 in words is "twenty-one billion, two hundred three million, three hundred two thousand, one hundred twenty".