420034343221 has 2 divisors, whose sum is σ = 420034343222. Its totient is φ = 420034343220.

The previous prime is 420034343213. The next prime is 420034343251. The reversal of 420034343221 is 122343430024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275908572900 + 144125770321 = 525270^2 + 379639^2 .

It is a cyclic number.

It is not a de Polignac number, because 420034343221 - 2³ = 420034343213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420034343221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420034343251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210017171610 + 210017171611.

It is an arithmetic number, because the mean of its divisors is an integer number (210017171611).

Almost surely, 2^420034343221 is an apocalyptic number.

It is an amenable number.

420034343221 is a deficient number, since it is larger than the sum of its proper divisors (1).

420034343221 is an equidigital number, since it uses as much as digits as its factorization.

420034343221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 420034343221 its reverse (122343430024), we get a palindrome (542377773245).

The spelling of 420034343221 in words is "four hundred twenty billion, thirty-four million, three hundred forty-three thousand, two hundred twenty-one".