21323401121 has 16 divisors (see below), whose sum is σ = 24638204160. Its totient is φ = 18238721280.

The previous prime is 21323401063. The next prime is 21323401199. The reversal of 21323401121 is 12110432312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21323401121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21323401093 and 21323401102.

It is not an unprimeable number, because it can be changed into a prime (21323401921) 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, 620375 + ... + 653843.

It is an arithmetic number, because the mean of its divisors is an integer number (1539887760).

Almost surely, 2^21323401121 is an apocalyptic number.

It is an amenable number.

21323401121 is a deficient number, since it is larger than the sum of its proper divisors (3314803039).

21323401121 is a wasteful number, since it uses less digits than its factorization.

21323401121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36904.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21323401121 its reverse (12110432312), we get a palindrome (33433833433).

The spelling of 21323401121 in words is "twenty-one billion, three hundred twenty-three million, four hundred one thousand, one hundred twenty-one".