21021300313220 has 12 divisors (see below), whose sum is σ = 44144730657804. Its totient is φ = 8408520125280.

The previous prime is 21021300313219. The next prime is 21021300313249. The reversal of 21021300313220 is 2231300312012.

It can be written as a sum of positive squares in 2 ways, for example, as 6043022561536 + 14978277751684 = 2458256^2 + 3870178^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1051065015661 = 21021300313220 / (2 + 1 + 0 + 2 + 1 + 3 + 0 + 0 + 3 + 1 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21021300313192 and 21021300313201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525532507811 + ... + 525532507850.

It is an arithmetic number, because the mean of its divisors is an integer number (3678727554817).

Almost surely, 2^{21021300313220} is an apocalyptic number.

21021300313220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021300313220 is an abundant number, since it is smaller than the sum of its proper divisors (23123430344584).

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

21021300313220 is a wasteful number, since it uses less digits than its factorization.

21021300313220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051065015670 (or 1051065015668 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21021300313220 its reverse (2231300312012), we get a palindrome (23252600625232).

The spelling of 21021300313220 in words is "twenty-one trillion, twenty-one billion, three hundred million, three hundred thirteen thousand, two hundred twenty".