21013321023030 has 256 divisors, whose sum is σ = 61626409943040. Its totient is φ = 4478737536000.

The previous prime is 21013321022987. The next prime is 21013321023031. The reversal of 21013321023030 is 3032012331012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21013321022988 and 21013321023006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013321023031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 171895930 + ... + 172018130.

It is an arithmetic number, because the mean of its divisors is an integer number (240728163840).

Almost surely, 2^{21013321023030} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21013321023030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30813204971520).

21013321023030 is an abundant number, since it is smaller than the sum of its proper divisors (40613088920010).

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

21013321023030 is a wasteful number, since it uses less digits than its factorization.

21013321023030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122915.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21013321023030 its reverse (3032012331012), we get a palindrome (24045333354042).

The spelling of 21013321023030 in words is "twenty-one trillion, thirteen billion, three hundred twenty-one million, twenty-three thousand, thirty".