210342101621 has 2 divisors, whose sum is σ = 210342101622. Its totient is φ = 210342101620.

The previous prime is 210342101611. The next prime is 210342101623. The reversal of 210342101621 is 126101243012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160428286225 + 49913815396 = 400535^2 + 223414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210342101621 is a prime.

Together with 210342101623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210342101623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105171050810 + 105171050811.

It is an arithmetic number, because the mean of its divisors is an integer number (105171050811).

Almost surely, 2^210342101621 is an apocalyptic number.

It is an amenable number.

210342101621 is a deficient number, since it is larger than the sum of its proper divisors (1).

210342101621 is an equidigital number, since it uses as much as digits as its factorization.

210342101621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 210342101621 its reverse (126101243012), we get a palindrome (336443344633).

The spelling of 210342101621 in words is "two hundred ten billion, three hundred forty-two million, one hundred one thousand, six hundred twenty-one".