3420624717221 has 2 divisors, whose sum is σ = 3420624717222. Its totient is φ = 3420624717220.

The previous prime is 3420624717179. The next prime is 3420624717317. The reversal of 3420624717221 is 1227174260243.

It is a happy number.

3420624717221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2986588830625 + 434035886596 = 1728175^2 + 658814^2 .

It is an emirp because it is prime and its reverse (1227174260243) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3420624717221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3420624716221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1710312358610 + 1710312358611.

It is an arithmetic number, because the mean of its divisors is an integer number (1710312358611).

Almost surely, 2^{3420624717221} is an apocalyptic number.

It is an amenable number.

3420624717221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3420624717221 is an equidigital number, since it uses as much as digits as its factorization.

3420624717221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 41.

Adding to 3420624717221 its reverse (1227174260243), we get a palindrome (4647798977464).

The spelling of 3420624717221 in words is "three trillion, four hundred twenty billion, six hundred twenty-four million, seven hundred seventeen thousand, two hundred twenty-one".