21303010420 has 72 divisors (see below), whose sum is σ = 48552665112. Its totient is φ = 7824138240.

The previous prime is 21303010411. The next prime is 21303010457. The reversal of 21303010420 is 2401030312.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 9655420644 + 11647589776 = 98262^2 + 107924^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21303010394 and 21303010403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 552904 + ... + 590176.

It is an arithmetic number, because the mean of its divisors is an integer number (674342571).

Almost surely, 2^21303010420 is an apocalyptic number.

21303010420 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 21303010420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24276332556).

21303010420 is an abundant number, since it is smaller than the sum of its proper divisors (27249654692).

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

21303010420 is a wasteful number, since it uses less digits than its factorization.

21303010420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37381 (or 37338 counting only the distinct ones).

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

Adding to 21303010420 its reverse (2401030312), we get a palindrome (23704040732).

The spelling of 21303010420 in words is "twenty-one billion, three hundred three million, ten thousand, four hundred twenty".