21203303220 has 72 divisors (see below), whose sum is σ = 70163664480. Its totient is φ = 5140194240.

The previous prime is 21203303207. The next prime is 21203303221. The reversal of 21203303220 is 2230330212.

It is a happy number.

21203303220 is a `hidden beast` number, since 2 + 12 + 0 + 330 + 322 + 0 = 666.

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 = 21203303193 and 21203303202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203303221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5352390 + ... + 5356349.

It is an arithmetic number, because the mean of its divisors is an integer number (974495340).

Almost surely, 2^21203303220 is an apocalyptic number.

21203303220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203303220 is an abundant number, since it is smaller than the sum of its proper divisors (48960361260).

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

21203303220 is a wasteful number, since it uses less digits than its factorization.

21203303220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10708765 (or 10708760 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21203303220 its reverse (2230330212), we get a palindrome (23433633432).

It can be divided in two parts, 21203 and 303220, that added together give a palindrome (324423).

The spelling of 21203303220 in words is "twenty-one billion, two hundred three million, three hundred three thousand, two hundred twenty".