100020002 has 4 divisors (see below), whose sum is σ = 150030006. Its totient is φ = 50010000.

The previous prime is 100019977. The next prime is 100020023. The reversal of 100020002 is 200020001.

It is a Cunningham number, because it is equal to 10001²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 200020001 = 569 ⋅351529.

It can be written as a sum of positive squares in only one way, i.e., 100020001 + 1 = 10001^2 + 1^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25004999 + ... + 25005002.

Almost surely, 2^100020002 is an apocalyptic number.

100020002 is a deficient number, since it is larger than the sum of its proper divisors (50010004).

100020002 is an equidigital number, since it uses as much as digits as its factorization.

100020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50010003.

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 100020002 is about 10001.0000499950. Note that the first 4 decimals coincide. The cubic root of 100020002 is about 464.1898283181.

Adding to 100020002 its reverse (200020001), we get a palindrome (300040003).

Subtracting 100020002 from its reverse (200020001), we obtain a palindrome (99999999).

The spelling of 100020002 in words is "one hundred million, twenty thousand, two".