21232303121 has 2 divisors, whose sum is σ = 21232303122. Its totient is φ = 21232303120.

The previous prime is 21232303111. The next prime is 21232303231. The reversal of 21232303121 is 12130323212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17956000000 + 3276303121 = 134000^2 + 57239^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232303121 - 2¹⁰ = 21232302097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21232303093 and 21232303102.

It is not a weakly prime, because it can be changed into another prime (21232303111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616151560 + 10616151561.

It is an arithmetic number, because the mean of its divisors is an integer number (10616151561).

Almost surely, 2^21232303121 is an apocalyptic number.

It is an amenable number.

21232303121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232303121 is an equidigital number, since it uses as much as digits as its factorization.

21232303121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21232303121 its reverse (12130323212), we get a palindrome (33362626333).

The spelling of 21232303121 in words is "twenty-one billion, two hundred thirty-two million, three hundred three thousand, one hundred twenty-one".