221121221022101 has 4 divisors (see below), whose sum is σ = 221124253850304. Its totient is φ = 221118188193900.

The previous prime is 221121221022073. The next prime is 221121221022193. The reversal of 221121221022101 is 101220122121122.

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-221121221022101 is a prime.

It is a super-2 number, since 2×221121221022101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121221322101) 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, 1516304735 + ... + 1516450556.

It is an arithmetic number, because the mean of its divisors is an integer number (55281063462576).

Almost surely, 2^{221121221022101} is an apocalyptic number.

It is an amenable number.

221121221022101 is a deficient number, since it is larger than the sum of its proper divisors (3032828203).

221121221022101 is an equidigital number, since it uses as much as digits as its factorization.

221121221022101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032828202.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221121221022101 its reverse (101220122121122), we get a palindrome (322341343143223).

The spelling of 221121221022101 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred one".