21303012220 has 24 divisors (see below), whose sum is σ = 51127229664. Its totient is φ = 7303889856.

The previous prime is 21303012197. The next prime is 21303012271. The reversal of 21303012220 is 2221030312.

It is a junction number, because it is equal to n+sod(n) for n = 21303012194 and 21303012203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76082047 + ... + 76082326.

It is an arithmetic number, because the mean of its divisors is an integer number (2130301236).

Almost surely, 2^21303012220 is an apocalyptic number.

21303012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303012220 is an abundant number, since it is smaller than the sum of its proper divisors (29824217444).

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

21303012220 is a wasteful number, since it uses less digits than its factorization.

21303012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152164389 (or 152164387 counting only the distinct ones).

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

Adding to 21303012220 its reverse (2221030312), we get a palindrome (23524042532).

The spelling of 21303012220 in words is "twenty-one billion, three hundred three million, twelve thousand, two hundred twenty".