221122001221 has 4 divisors (see below), whose sum is σ = 241224001344. Its totient is φ = 201020001100.

The previous prime is 221122001189. The next prime is 221122001323. The reversal of 221122001221 is 122100221122.

It is a happy number.

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 221122001221 - 2⁵ = 221122001189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221122001195 and 221122001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122001021) 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, 10051000045 + ... + 10051000066.

It is an arithmetic number, because the mean of its divisors is an integer number (60306000336).

Almost surely, 2^221122001221 is an apocalyptic number.

It is an amenable number.

221122001221 is a deficient number, since it is larger than the sum of its proper divisors (20102000123).

221122001221 is a wasteful number, since it uses less digits than its factorization.

221122001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20102000122.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221122001221 its reverse (122100221122), we get a palindrome (343222222343).

The spelling of 221122001221 in words is "two hundred twenty-one billion, one hundred twenty-two million, one thousand, two hundred twenty-one".