100021220102021 has 4 divisors (see below), whose sum is σ = 101011529212044. Its totient is φ = 99030910992000.

The previous prime is 100021220101951. The next prime is 100021220102029. The reversal of 100021220102021 is 120201022120001.

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 89635714852996 + 10385505249025 = 9467614^2 + 3222655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100021220102021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100021220101987 and 100021220102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021220102029) 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, 495154554860 + ... + 495154555061.

It is an arithmetic number, because the mean of its divisors is an integer number (25252882303011).

Almost surely, 2^{100021220102021} is an apocalyptic number.

It is an amenable number.

100021220102021 is a deficient number, since it is larger than the sum of its proper divisors (990309110023).

100021220102021 is an equidigital number, since it uses as much as digits as its factorization.

100021220102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990309110022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 100021220102021 its reverse (120201022120001), we get a palindrome (220222242222022).

The spelling of 100021220102021 in words is "one hundred trillion, twenty-one billion, two hundred twenty million, one hundred two thousand, twenty-one".