100042221 has 4 divisors (see below), whose sum is σ = 133389632. Its totient is φ = 66694812.

The previous prime is 100042207. The next prime is 100042237. The reversal of 100042221 is 122240001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 100042221 - 2¹³ = 100034029 is a prime.

It is a super-2 number, since 2×100042221² = 20016891965225682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100042197 and 100042206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100042291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16673701 + ... + 16673706.

It is an arithmetic number, because the mean of its divisors is an integer number (33347408).

Almost surely, 2^100042221 is an apocalyptic number.

It is an amenable number.

100042221 is a deficient number, since it is larger than the sum of its proper divisors (33347411).

100042221 is an equidigital number, since it uses as much as digits as its factorization.

100042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33347410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 100042221 is about 10002.1108272204. The cubic root of 100042221 is about 464.2241983440.

Adding to 100042221 its reverse (122240001), we get a palindrome (222282222).

The spelling of 100042221 in words is "one hundred million, forty-two thousand, two hundred twenty-one".