42100423 has 2 divisors, whose sum is σ = 42100424. Its totient is φ = 42100422.

The previous prime is 42100403. The next prime is 42100433. The reversal of 42100423 is 32400124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42100423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42100397 and 42100406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42100403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21050211 + 21050212.

It is an arithmetic number, because the mean of its divisors is an integer number (21050212).

Almost surely, 2^42100423 is an apocalyptic number.

42100423 is a deficient number, since it is larger than the sum of its proper divisors (1).

42100423 is an equidigital number, since it uses as much as digits as its factorization.

42100423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42100423 is about 6488.4838752978. The cubic root of 42100423 is about 347.8794860591.

Adding to 42100423 its reverse (32400124), we get a palindrome (74500547).

The spelling of 42100423 in words is "forty-two million, one hundred thousand, four hundred twenty-three".