100202101100021 has 4 divisors (see below), whose sum is σ = 100425268363500. Its totient is φ = 99978933836544.

The previous prime is 100202101100011. The next prime is 100202101100083. The reversal of 100202101100021 is 120001101202001.

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 68545566600625 + 31656534499396 = 8279225^2 + 5626414^2 .

It is a cyclic number.

It is not a de Polignac number, because 100202101100021 - 2⁶ = 100202101099957 is a prime.

It is a super-2 number, since 2×100202101100021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100202101099975 and 100202101100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100202101100011) 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, 111583631066 + ... + 111583631963.

It is an arithmetic number, because the mean of its divisors is an integer number (25106317090875).

Almost surely, 2^{100202101100021} is an apocalyptic number.

It is an amenable number.

100202101100021 is a deficient number, since it is larger than the sum of its proper divisors (223167263479).

100202101100021 is an equidigital number, since it uses as much as digits as its factorization.

100202101100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223167263478.

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

Adding to 100202101100021 its reverse (120001101202001), we get a palindrome (220203202302022).

The spelling of 100202101100021 in words is "one hundred trillion, two hundred two billion, one hundred one million, one hundred thousand, twenty-one".