100000100021 has 4 divisors (see below), whose sum is σ = 105263263200. Its totient is φ = 94736936844.

The previous prime is 100000100009. The next prime is 100000100033. The reversal of 100000100021 is 120001000001.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (100000100009) and next prime (100000100033).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100000100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100000099978 and 100000100014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000100821) 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, 2631581561 + ... + 2631581598.

It is an arithmetic number, because the mean of its divisors is an integer number (26315815800).

Almost surely, 2^100000100021 is an apocalyptic number.

It is an amenable number.

100000100021 is a deficient number, since it is larger than the sum of its proper divisors (5263163179).

100000100021 is an equidigital number, since it uses as much as digits as its factorization.

100000100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263163178.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 100000100021 its reverse (120001000001), we get a palindrome (220001100022).

The spelling of 100000100021 in words is "one hundred billion, one hundred thousand, twenty-one".