21323212121303 has 16 divisors (see below), whose sum is σ = 21553055251200. Its totient is φ = 21094487793600.

The previous prime is 21323212121293. The next prime is 21323212121329. The reversal of 21323212121303 is 30312121232312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21323212121303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323212121353) 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, 54025451 + ... + 54418707.

It is an arithmetic number, because the mean of its divisors is an integer number (1347065953200).

Almost surely, 2^{21323212121303} is an apocalyptic number.

21323212121303 is a deficient number, since it is larger than the sum of its proper divisors (229843129897).

21323212121303 is a wasteful number, since it uses less digits than its factorization.

21323212121303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394678.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21323212121303 its reverse (30312121232312), we get a palindrome (51635333353615).

The spelling of 21323212121303 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred twelve million, one hundred twenty-one thousand, three hundred three".