21343122001 has 2 divisors, whose sum is σ = 21343122002. Its totient is φ = 21343122000.

The previous prime is 21343121999. The next prime is 21343122011. The reversal of 21343122001 is 10022134312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20284595776 + 1058526225 = 142424^2 + 32535^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343122001 - 2¹ = 21343121999 is a prime.

Together with 21343121999, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21343122001.

It is not a weakly prime, because it can be changed into another prime (21343122011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671561000 + 10671561001.

It is an arithmetic number, because the mean of its divisors is an integer number (10671561001).

Almost surely, 2^21343122001 is an apocalyptic number.

It is an amenable number.

21343122001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343122001 is an equidigital number, since it uses as much as digits as its factorization.

21343122001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21343122001 its reverse (10022134312), we get a palindrome (31365256313).

The spelling of 21343122001 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-two thousand, one".