3420444210221 has 2 divisors, whose sum is σ = 3420444210222. Its totient is φ = 3420444210220.

The previous prime is 3420444210199. The next prime is 3420444210283. The reversal of 3420444210221 is 1220124440243.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2719893624100 + 700550586121 = 1649210^2 + 836989^2 .

It is an emirp because it is prime and its reverse (1220124440243) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3420444210221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3420444212221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1710222105110 + 1710222105111.

It is an arithmetic number, because the mean of its divisors is an integer number (1710222105111).

Almost surely, 2^{3420444210221} is an apocalyptic number.

It is an amenable number.

3420444210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3420444210221 is an equidigital number, since it uses as much as digits as its factorization.

3420444210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 3420444210221 its reverse (1220124440243), we get a palindrome (4640568650464).

The spelling of 3420444210221 in words is "three trillion, four hundred twenty billion, four hundred forty-four million, two hundred ten thousand, two hundred twenty-one".