21303223130321 has 16 divisors (see below), whose sum is σ = 23268423149568. Its totient is φ = 19342793355600.

The previous prime is 21303223130303. The next prime is 21303223130351. The reversal of 21303223130321 is 12303132230312.

It is not a de Polignac number, because 21303223130321 - 2³⁸ = 21028345223377 is a prime.

It is a super-2 number, since 2×21303223130321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303223130351) 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, 32595926 + ... + 33243056.

It is an arithmetic number, because the mean of its divisors is an integer number (1454276446848).

Almost surely, 2^{21303223130321} is an apocalyptic number.

It is an amenable number.

21303223130321 is a deficient number, since it is larger than the sum of its proper divisors (1965200019247).

21303223130321 is a wasteful number, since it uses less digits than its factorization.

21303223130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650812.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21303223130321 its reverse (12303132230312), we get a palindrome (33606355360633).

Subtracting from 21303223130321 its reverse (12303132230312), we obtain a palindrome (9000090900009).

The spelling of 21303223130321 in words is "twenty-one trillion, three hundred three billion, two hundred twenty-three million, one hundred thirty thousand, three hundred twenty-one".