221102201001221 has 4 divisors (see below), whose sum is σ = 221111566190700. Its totient is φ = 221092835811744.

The previous prime is 221102201001211. The next prime is 221102201001223. The reversal of 221102201001221 is 122100102201122.

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 125764337380900 + 95337863620321 = 11214470^2 + 9764111^2 .

It is a cyclic number.

It is not a de Polignac number, because 221102201001221 - 2²² = 221102196806917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221102201001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102201001223) 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, 4682559326 + ... + 4682606543.

It is an arithmetic number, because the mean of its divisors is an integer number (55277891547675).

Almost surely, 2^{221102201001221} is an apocalyptic number.

It is an amenable number.

221102201001221 is a deficient number, since it is larger than the sum of its proper divisors (9365189479).

221102201001221 is an equidigital number, since it uses as much as digits as its factorization.

221102201001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9365189478.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221102201001221 its reverse (122100102201122), we get a palindrome (343202303202343).

The spelling of 221102201001221 in words is "two hundred twenty-one trillion, one hundred two billion, two hundred one million, one thousand, two hundred twenty-one".