21303230020220 has 192 divisors, whose sum is σ = 48317403488256. Its totient is φ = 7860352389120.

The previous prime is 21303230020211. The next prime is 21303230020361. The reversal of 21303230020220 is 2202003230312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21303230020192 and 21303230020201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10207584017 + ... + 10207586103.

It is an arithmetic number, because the mean of its divisors is an integer number (251653143168).

Almost surely, 2^{21303230020220} is an apocalyptic number.

21303230020220 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 21303230020220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24158701744128).

21303230020220 is an abundant number, since it is smaller than the sum of its proper divisors (27014173468036).

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

21303230020220 is a wasteful number, since it uses less digits than its factorization.

21303230020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700 (or 3698 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21303230020220 its reverse (2202003230312), we get a palindrome (23505233250532).

The spelling of 21303230020220 in words is "twenty-one trillion, three hundred three billion, two hundred thirty million, twenty thousand, two hundred twenty".