21021300213320 has 64 divisors (see below), whose sum is σ = 51601833604800. Its totient is φ = 7643502247680.

The previous prime is 21021300213317. The next prime is 21021300213323. The reversal of 21021300213320 is 2331200312012.

It is an interprime number because it is at equal distance from previous prime (21021300213317) and next prime (21021300213323).

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 = 21021300213292 and 21021300213301.

It is not an unprimeable number, because it can be changed into a prime (21021300213323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3669971 + ... + 7450589.

It is an arithmetic number, because the mean of its divisors is an integer number (806278650075).

Almost surely, 2^{21021300213320} is an apocalyptic number.

21021300213320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021300213320 is an abundant number, since it is smaller than the sum of its proper divisors (30580533391480).

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

21021300213320 is a wasteful number, since it uses less digits than its factorization.

21021300213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3793278 (or 3793274 counting only the distinct ones).

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

Adding to 21021300213320 its reverse (2331200312012), we get a palindrome (23352500525332).

The spelling of 21021300213320 in words is "twenty-one trillion, twenty-one billion, three hundred million, two hundred thirteen thousand, three hundred twenty".