21001321320030 has 48 divisors (see below), whose sum is σ = 54930402150624. Its totient is φ = 5566817304000.

The previous prime is 21001321319921. The next prime is 21001321320037. The reversal of 21001321320030 is 3002312310012.

21001321320030 is a `hidden beast` number, since 21 + 0 + 0 + 1 + 321 + 320 + 0 + 3 + 0 = 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 = 21001321319985 and 21001321320012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001321320037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 698631721 + ... + 698661780.

It is an arithmetic number, because the mean of its divisors is an integer number (1144383378138).

Almost surely, 2^{21001321320030} is an apocalyptic number.

21001321320030 is an abundant number, since it is smaller than the sum of its proper divisors (33929080830594).

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

21001321320030 is a wasteful number, since it uses less digits than its factorization.

21001321320030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397293681 (or 1397293678 counting only the distinct ones).

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

Adding to 21001321320030 its reverse (3002312310012), we get a palindrome (24003633630042).

The spelling of 21001321320030 in words is "twenty-one trillion, one billion, three hundred twenty-one million, three hundred twenty thousand, thirty".