42105251 has 2 divisors, whose sum is σ = 42105252. Its totient is φ = 42105250.

The previous prime is 42105247. The next prime is 42105253. The reversal of 42105251 is 15250124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42105251 - 2² = 42105247 is a prime.

Together with 42105253, 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 (42105253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21052625 + 21052626.

It is an arithmetic number, because the mean of its divisors is an integer number (21052626).

Almost surely, 2^42105251 is an apocalyptic number.

42105251 is a deficient number, since it is larger than the sum of its proper divisors (1).

42105251 is an equidigital number, since it uses as much as digits as its factorization.

42105251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 42105251 is about 6488.8559084017. The cubic root of 42105251 is about 347.8927836132.

Adding to 42105251 its reverse (15250124), we get a palindrome (57355375).

The spelling of 42105251 in words is "forty-two million, one hundred five thousand, two hundred fifty-one".