221200100021101 has 4 divisors (see below), whose sum is σ = 221246347172032. Its totient is φ = 221153852870172.

The previous prime is 221200100021039. The next prime is 221200100021111. The reversal of 221200100021101 is 101120001002122.

221200100021101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221200100021101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200100021111) 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, 23123568291 + ... + 23123577856.

It is an arithmetic number, because the mean of its divisors is an integer number (55311586793008).

Almost surely, 2^{221200100021101} is an apocalyptic number.

It is an amenable number.

221200100021101 is a deficient number, since it is larger than the sum of its proper divisors (46247150931).

221200100021101 is an equidigital number, since it uses as much as digits as its factorization.

221200100021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46247150930.

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

Adding to 221200100021101 its reverse (101120001002122), we get a palindrome (322320101023223).

The spelling of 221200100021101 in words is "two hundred twenty-one trillion, two hundred billion, one hundred million, twenty-one thousand, one hundred one".