221121010221 has 4 divisors (see below), whose sum is σ = 294828013632. Its totient is φ = 147414006812.

The previous prime is 221121010147. The next prime is 221121010261. The reversal of 221121010221 is 122010121122.

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 221121010221 - 2¹³ = 221121002029 is a prime.

It is a super-2 number, since 2×221121010221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221121010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121010261) 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, 36853501701 + ... + 36853501706.

It is an arithmetic number, because the mean of its divisors is an integer number (73707003408).

Almost surely, 2^221121010221 is an apocalyptic number.

It is an amenable number.

221121010221 is a deficient number, since it is larger than the sum of its proper divisors (73707003411).

221121010221 is an equidigital number, since it uses as much as digits as its factorization.

221121010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73707003410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221121010221 its reverse (122010121122), we get a palindrome (343131131343).

The spelling of 221121010221 in words is "two hundred twenty-one billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".