100200010021 has 4 divisors (see below), whose sum is σ = 101572612972. Its totient is φ = 98827407072.

The previous prime is 100200010019. The next prime is 100200010049. The reversal of 100200010021 is 120010002001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120010002001 = 9371 ⋅12806531.

It can be written as a sum of positive squares in 2 ways, for example, as 44744940900 + 55455069121 = 211530^2 + 235489^2 .

It is a cyclic number.

It is not a de Polignac number, because 100200010021 - 2¹ = 100200010019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100200009986 and 100200010013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100200010051) 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, 686301366 + ... + 686301511.

It is an arithmetic number, because the mean of its divisors is an integer number (25393153243).

Almost surely, 2^100200010021 is an apocalyptic number.

It is an amenable number.

100200010021 is a deficient number, since it is larger than the sum of its proper divisors (1372602951).

100200010021 is an equidigital number, since it uses as much as digits as its factorization.

100200010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372602950.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 100200010021 its reverse (120010002001), we get a palindrome (220210012022).

The spelling of 100200010021 in words is "one hundred billion, two hundred million, ten thousand, twenty-one".