21012303310020 has 288 divisors, whose sum is σ = 71567228992896. Its totient is φ = 4945365964800.

The previous prime is 21012303309947. The next prime is 21012303310049. The reversal of 21012303310020 is 2001330321012.

21012303310020 is a `hidden beast` number, since 2 + 101 + 230 + 3 + 310 + 0 + 20 = 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 = 21012303309975 and 21012303310002.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 33166015 + ... + 33793625.

It is an arithmetic number, because the mean of its divisors is an integer number (248497322892).

Almost surely, 2^{21012303310020} is an apocalyptic number.

21012303310020 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 21012303310020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35783614496448).

21012303310020 is an abundant number, since it is smaller than the sum of its proper divisors (50554925682876).

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

21012303310020 is a wasteful number, since it uses less digits than its factorization.

21012303310020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628131 (or 628126 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21012303310020 its reverse (2001330321012), we get a palindrome (23013633631032).

The spelling of 21012303310020 in words is "twenty-one trillion, twelve billion, three hundred three million, three hundred ten thousand, twenty".