21023442331320 has 256 divisors, whose sum is σ = 74108311603200. Its totient is φ = 4703803453440.

The previous prime is 21023442331291. The next prime is 21023442331327. The reversal of 21023442331320 is 2313324432012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023442331327) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 112356001 + ... + 112542959.

It is an arithmetic number, because the mean of its divisors is an integer number (289485592200).

Almost surely, 2^{21023442331320} is an apocalyptic number.

21023442331320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023442331320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37054155801600).

21023442331320 is an abundant number, since it is smaller than the sum of its proper divisors (53084869271880).

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

21023442331320 is a wasteful number, since it uses less digits than its factorization.

21023442331320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193550 (or 193546 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 21023442331320 its reverse (2313324432012), we get a palindrome (23336766763332).

The spelling of 21023442331320 in words is "twenty-one trillion, twenty-three billion, four hundred forty-two million, three hundred thirty-one thousand, three hundred twenty".