100001201021021 has 4 divisors (see below), whose sum is σ = 100886167401852. Its totient is φ = 99116234640192.

The previous prime is 100001201020991. The next prime is 100001201021153. The reversal of 100001201021021 is 120120102100001.

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 1189430172100 + 98811770848921 = 1090610^2 + 9940411^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001201021021 - 2⁴² = 95603154509917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100001201020993 and 100001201021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001201021321) 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, 442483190246 + ... + 442483190471.

It is an arithmetic number, because the mean of its divisors is an integer number (25221541850463).

Almost surely, 2^{100001201021021} is an apocalyptic number.

It is an amenable number.

100001201021021 is a deficient number, since it is larger than the sum of its proper divisors (884966380831).

100001201021021 is an equidigital number, since it uses as much as digits as its factorization.

100001201021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884966380830.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100001201021021 its reverse (120120102100001), we get a palindrome (220121303121022).

The spelling of 100001201021021 in words is "one hundred trillion, one billion, two hundred one million, twenty-one thousand, twenty-one".