101100202120021 has 4 divisors (see below), whose sum is σ = 108877140744652. Its totient is φ = 93323263495392.

The previous prime is 101100202119989. The next prime is 101100202120033. The reversal of 101100202120021 is 120021202001101.

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 17599241571025 + 83500960548996 = 4195145^2 + 9137886^2 .

It is a cyclic number.

It is not a de Polignac number, because 101100202120021 - 2⁵ = 101100202119989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 7776938624617 = 101100202120021 / (1 + 0 + 1 + 1 + 0 + 0 + 2 + 0 + 2 + 1 + 2 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101100202119983 and 101100202120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101100202120081) 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, 3888469312296 + ... + 3888469312321.

It is an arithmetic number, because the mean of its divisors is an integer number (27219285186163).

Almost surely, 2^{101100202120021} is an apocalyptic number.

It is an amenable number.

101100202120021 is a deficient number, since it is larger than the sum of its proper divisors (7776938624631).

101100202120021 is an equidigital number, since it uses as much as digits as its factorization.

101100202120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7776938624630.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101100202120021 its reverse (120021202001101), we get a palindrome (221121404121122).

The spelling of 101100202120021 in words is "one hundred one trillion, one hundred billion, two hundred two million, one hundred twenty thousand, twenty-one".