210442121251 has 2 divisors, whose sum is σ = 210442121252. Its totient is φ = 210442121250.

The previous prime is 210442121249. The next prime is 210442121353. The reversal of 210442121251 is 152121244012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210442121251 - 2¹ = 210442121249 is a prime.

Together with 210442121249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (210442181251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105221060625 + 105221060626.

It is an arithmetic number, because the mean of its divisors is an integer number (105221060626).

Almost surely, 2^210442121251 is an apocalyptic number.

210442121251 is a deficient number, since it is larger than the sum of its proper divisors (1).

210442121251 is an equidigital number, since it uses as much as digits as its factorization.

210442121251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 210442121251 its reverse (152121244012), we get a palindrome (362563365263).

The spelling of 210442121251 in words is "two hundred ten billion, four hundred forty-two million, one hundred twenty-one thousand, two hundred fifty-one".