100001099021 has 2 divisors, whose sum is σ = 100001099022. Its totient is φ = 100001099020.

The previous prime is 100001098999. The next prime is 100001099089. The reversal of 100001099021 is 120990100001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80752588900 + 19248510121 = 284170^2 + 138739^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001099021 - 2²² = 99996904717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001099321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000549510 + 50000549511.

It is an arithmetic number, because the mean of its divisors is an integer number (50000549511).

Almost surely, 2^100001099021 is an apocalyptic number.

It is an amenable number.

100001099021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001099021 is an equidigital number, since it uses as much as digits as its factorization.

100001099021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

Adding to 100001099021 its reverse (120990100001), we get a palindrome (220991199022).

The spelling of 100001099021 in words is "one hundred billion, one million, ninety-nine thousand, twenty-one".