100020122021 has 4 divisors (see below), whose sum is σ = 100381205772. Its totient is φ = 99659038272.

The previous prime is 100020121963. The next prime is 100020122051. The reversal of 100020122021 is 120221020001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53467312900 + 46552809121 = 231230^2 + 215761^2 .

It is a cyclic number.

It is not a de Polignac number, because 100020122021 - 2¹⁴ = 100020105637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100020121993 and 100020122011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100020122051) 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, 180541460 + ... + 180542013.

It is an arithmetic number, because the mean of its divisors is an integer number (25095301443).

Almost surely, 2^100020122021 is an apocalyptic number.

It is an amenable number.

100020122021 is a deficient number, since it is larger than the sum of its proper divisors (361083751).

100020122021 is an equidigital number, since it uses as much as digits as its factorization.

100020122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361083750.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100020122021 its reverse (120221020001), we get a palindrome (220241142022).

The spelling of 100020122021 in words is "one hundred billion, twenty million, one hundred twenty-two thousand, twenty-one".