221121101 has 4 divisors (see below), whose sum is σ = 221311104. Its totient is φ = 220931100.

The previous prime is 221121071. The next prime is 221121113. The reversal of 221121101 is 101121122.

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 not a de Polignac number, because 221121101 - 2¹⁴ = 221104717 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 (221121181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93245 + ... + 95586.

It is an arithmetic number, because the mean of its divisors is an integer number (55327776).

Almost surely, 2^221121101 is an apocalyptic number.

It is an amenable number.

221121101 is a deficient number, since it is larger than the sum of its proper divisors (190003).

221121101 is a wasteful number, since it uses less digits than its factorization.

221121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190002.

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

The square root of 221121101 is about 14870.1412568946. The cubic root of 221121101 is about 604.7047722892.

Adding to 221121101 its reverse (101121122), we get a palindrome (322242223).

The spelling of 221121101 in words is "two hundred twenty-one million, one hundred twenty-one thousand, one hundred one".