221120244421 has 2 divisors, whose sum is σ = 221120244422. Its totient is φ = 221120244420.

The previous prime is 221120244353. The next prime is 221120244437. The reversal of 221120244421 is 124442021122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214845228196 + 6275016225 = 463514^2 + 79215^2 .

It is a cyclic number.

It is not a de Polignac number, because 221120244421 - 2¹³ = 221120236229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221120244461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560122210 + 110560122211.

It is an arithmetic number, because the mean of its divisors is an integer number (110560122211).

Almost surely, 2^221120244421 is an apocalyptic number.

It is an amenable number.

221120244421 is a deficient number, since it is larger than the sum of its proper divisors (1).

221120244421 is an equidigital number, since it uses as much as digits as its factorization.

221120244421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 221120244421 its reverse (124442021122), we get a palindrome (345562265543).

The spelling of 221120244421 in words is "two hundred twenty-one billion, one hundred twenty million, two hundred forty-four thousand, four hundred twenty-one".