21323002121 has 8 divisors (see below), whose sum is σ = 21645224160. Its totient is φ = 21000896928.

The previous prime is 21323002109. The next prime is 21323002123. The reversal of 21323002121 is 12120032312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21323002121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21323002121.

It is not an unprimeable number, because it can be changed into a prime (21323002123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381830 + ... + 434096.

It is an arithmetic number, because the mean of its divisors is an integer number (2705653020).

Almost surely, 2^21323002121 is an apocalyptic number.

It is an amenable number.

21323002121 is a deficient number, since it is larger than the sum of its proper divisors (322222039).

21323002121 is an equidigital number, since it uses as much as digits as its factorization.

21323002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58423.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21323002121 its reverse (12120032312), we get a palindrome (33443034433).

The spelling of 21323002121 in words is "twenty-one billion, three hundred twenty-three million, two thousand, one hundred twenty-one".