100420442 has 16 divisors (see below), whose sum is σ = 155011272. Its totient is φ = 48755520.

The previous prime is 100420427. The next prime is 100420447. The reversal of 100420442 is 244024001.

It is a Cunningham number, because it is equal to 10021²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 100420441 + 1 = 10021^2 + 1^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 100420442.

It is not an unprimeable number, because it can be changed into a prime (100420447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47888 + ... + 49940.

Almost surely, 2^100420442 is an apocalyptic number.

100420442 is a deficient number, since it is larger than the sum of its proper divisors (54590830).

100420442 is a wasteful number, since it uses less digits than its factorization.

100420442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 100420442 is about 10021.0000498952. Note that the first 4 decimals coincide. The cubic root of 100420442 is about 464.8084801150.

Adding to 100420442 its reverse (244024001), we get a palindrome (344444443).

The spelling of 100420442 in words is "one hundred million, four hundred twenty thousand, four hundred forty-two".