21000313200321 has 48 divisors (see below), whose sum is σ = 37343560240896. Its totient is φ = 11074219129728.

The previous prime is 21000313200311. The next prime is 21000313200329. The reversal of 21000313200321 is 12300231300012.

21000313200321 is a `hidden beast` number, since 2 + 10 + 0 + 0 + 313 + 20 + 0 + 321 = 666.

It is not a de Polignac number, because 21000313200321 - 2⁶ = 21000313200257 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21000313200294 and 21000313200303.

It is not an unprimeable number, because it can be changed into a prime (21000313200329) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155050 + ... + 6482643.

It is an arithmetic number, because the mean of its divisors is an integer number (777990838352).

Almost surely, 2^{21000313200321} is an apocalyptic number.

21000313200321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21000313200321 is a deficient number, since it is larger than the sum of its proper divisors (16343247040575).

21000313200321 is a wasteful number, since it uses less digits than its factorization.

21000313200321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6641582 (or 6641579 counting only the distinct ones).

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

Adding to 21000313200321 its reverse (12300231300012), we get a palindrome (33300544500333).

The spelling of 21000313200321 in words is "twenty-one trillion, three hundred thirteen million, two hundred thousand, three hundred twenty-one".