42216826 has 4 divisors (see below), whose sum is σ = 63325242. Its totient is φ = 21108412.

The previous prime is 42216821. The next prime is 42216827. The reversal of 42216826 is 62861224.

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

It can be written as a sum of positive squares in only one way, i.e., 35462025 + 6754801 = 5955^2 + 2599^2 .

It is not an unprimeable number, because it can be changed into a prime (42216821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10554205 + ... + 10554208.

Almost surely, 2^42216826 is an apocalyptic number.

42216826 is a deficient number, since it is larger than the sum of its proper divisors (21108416).

42216826 is a wasteful number, since it uses less digits than its factorization.

42216826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21108415.

The product of its digits is 9216, while the sum is 31.

The square root of 42216826 is about 6497.4476527326. The cubic root of 42216826 is about 348.1998070874.

The spelling of 42216826 in words is "forty-two million, two hundred sixteen thousand, eight hundred twenty-six".