100021300021 has 4 divisors (see below), whose sum is σ = 100023784492. Its totient is φ = 100018815552.

The previous prime is 100021299991. The next prime is 100021300039. The reversal of 100021300021 is 120003120001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120003120001 = 631 ⋅190179271.

It can be written as a sum of positive squares in 2 ways, for example, as 23381468100 + 76639831921 = 152910^2 + 276839^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021300021 - 2²³ = 100012911413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100021299980 and 100021300007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021300061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180836 + ... + 1262701.

It is an arithmetic number, because the mean of its divisors is an integer number (25005946123).

Almost surely, 2^100021300021 is an apocalyptic number.

It is an amenable number.

100021300021 is a deficient number, since it is larger than the sum of its proper divisors (2484471).

100021300021 is an equidigital number, since it uses as much as digits as its factorization.

100021300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484470.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 100021300021 its reverse (120003120001), we get a palindrome (220024420022).

The spelling of 100021300021 in words is "one hundred billion, twenty-one million, three hundred thousand, twenty-one".