221101000100201 has 4 divisors (see below), whose sum is σ = 238108769338692. Its totient is φ = 204093230861712.

The previous prime is 221101000100161. The next prime is 221101000100249. The reversal of 221101000100201 is 102001000101122.

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 41357105040601 + 179743895059600 = 6430949^2 + 13406860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221101000100201 is a prime.

It is a super-2 number, since 2×221101000100201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221101000130201) 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, 8503884619226 + ... + 8503884619251.

It is an arithmetic number, because the mean of its divisors is an integer number (59527192334673).

Almost surely, 2^{221101000100201} is an apocalyptic number.

It is an amenable number.

221101000100201 is a deficient number, since it is larger than the sum of its proper divisors (17007769238491).

221101000100201 is a wasteful number, since it uses less digits than its factorization.

221101000100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17007769238490.

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

Adding to 221101000100201 its reverse (102001000101122), we get a palindrome (323102000201323).

The spelling of 221101000100201 in words is "two hundred twenty-one trillion, one hundred one billion, one hundred thousand, two hundred one".