210421654235323 has 2 divisors, whose sum is σ = 210421654235324. Its totient is φ = 210421654235322.

The previous prime is 210421654235321. The next prime is 210421654235381. The reversal of 210421654235323 is 323532456124012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210421654235323 - 2¹ = 210421654235321 is a prime.

It is a super-2 number, since 2×210421654235323² (a number of 29 digits) contains 22 as substring.

Together with 210421654235321, 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 210421654235323.

It is not a weakly prime, because it can be changed into another prime (210421654235321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105210827117661 + 105210827117662.

It is an arithmetic number, because the mean of its divisors is an integer number (105210827117662).

Almost surely, 2^{210421654235323} is an apocalyptic number.

210421654235323 is a deficient number, since it is larger than the sum of its proper divisors (1).

210421654235323 is an equidigital number, since it uses as much as digits as its factorization.

210421654235323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 210421654235323 in words is "two hundred ten trillion, four hundred twenty-one billion, six hundred fifty-four million, two hundred thirty-five thousand, three hundred twenty-three".