101211210200021 has 4 divisors (see below), whose sum is σ = 102348414809100. Its totient is φ = 100074005590944.

The previous prime is 101211210200011. The next prime is 101211210200029. The reversal of 101211210200021 is 120002012112101.

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 10702149559396 + 90509060640625 = 3271414^2 + 9513625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101211210200021 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 = 101211210199969 and 101211210200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211210200029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568602304406 + ... + 568602304583.

It is an arithmetic number, because the mean of its divisors is an integer number (25587103702275).

Almost surely, 2^{101211210200021} is an apocalyptic number.

It is an amenable number.

101211210200021 is a deficient number, since it is larger than the sum of its proper divisors (1137204609079).

101211210200021 is an equidigital number, since it uses as much as digits as its factorization.

101211210200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137204609078.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 101211210200021 its reverse (120002012112101), we get a palindrome (221213222312122).

The spelling of 101211210200021 in words is "one hundred one trillion, two hundred eleven billion, two hundred ten million, two hundred thousand, twenty-one".