21322123001 has 2 divisors, whose sum is σ = 21322123002. Its totient is φ = 21322123000.

The previous prime is 21322122931. The next prime is 21322123003. The reversal of 21322123001 is 10032122312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17700972025 + 3621150976 = 133045^2 + 60176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21322123001 is a prime.

Together with 21322123003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21322123003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661061500 + 10661061501.

It is an arithmetic number, because the mean of its divisors is an integer number (10661061501).

Almost surely, 2^21322123001 is an apocalyptic number.

It is an amenable number.

21322123001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322123001 is an equidigital number, since it uses as much as digits as its factorization.

21322123001 is an evil number, because the sum of its binary digits is even.

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

Adding to 21322123001 its reverse (10032122312), we get a palindrome (31354245313).

The spelling of 21322123001 in words is "twenty-one billion, three hundred twenty-two million, one hundred twenty-three thousand, one".