42100999 has 4 divisors (see below), whose sum is σ = 43080136. Its totient is φ = 41121864.

The previous prime is 42100997. The next prime is 42101021. The reversal of 42100999 is 99900124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42100999 - 2¹ = 42100997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42100997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489504 + ... + 489589.

It is an arithmetic number, because the mean of its divisors is an integer number (10770034).

Almost surely, 2^42100999 is an apocalyptic number.

42100999 is a deficient number, since it is larger than the sum of its proper divisors (979137).

42100999 is an equidigital number, since it uses as much as digits as its factorization.

42100999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979136.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 42100999 is about 6488.5282614781. The cubic root of 42100999 is about 347.8810725647.

The spelling of 42100999 in words is "forty-two million, one hundred thousand, nine hundred ninety-nine".