42106220999 has 4 divisors (see below), whose sum is σ = 42124780440. Its totient is φ = 42087661560.

The previous prime is 42106220917. The next prime is 42106221019. The reversal of 42106220999 is 99902260124.

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 42106220999 - 2²⁰ = 42105172423 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 (42106220909) 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, 9276317 + ... + 9280854.

It is an arithmetic number, because the mean of its divisors is an integer number (10531195110).

Almost surely, 2^42106220999 is an apocalyptic number.

42106220999 is a deficient number, since it is larger than the sum of its proper divisors (18559441).

42106220999 is a wasteful number, since it uses less digits than its factorization.

42106220999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18559440.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 42106220999 in words is "forty-two billion, one hundred six million, two hundred twenty thousand, nine hundred ninety-nine".