21323312141 has 2 divisors, whose sum is σ = 21323312142. Its totient is φ = 21323312140.

The previous prime is 21323312107. The next prime is 21323312159. The reversal of 21323312141 is 14121332312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21074619241 + 248692900 = 145171^2 + 15770^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323312141 - 2¹⁰ = 21323311117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323312741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661656070 + 10661656071.

It is an arithmetic number, because the mean of its divisors is an integer number (10661656071).

Almost surely, 2^21323312141 is an apocalyptic number.

It is an amenable number.

21323312141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323312141 is an equidigital number, since it uses as much as digits as its factorization.

21323312141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 21323312141 its reverse (14121332312), we get a palindrome (35444644453).

The spelling of 21323312141 in words is "twenty-one billion, three hundred twenty-three million, three hundred twelve thousand, one hundred forty-one".