420043312121 has 2 divisors, whose sum is σ = 420043312122. Its totient is φ = 420043312120.

The previous prime is 420043312111. The next prime is 420043312163. The reversal of 420043312121 is 121213340024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372447781225 + 47595530896 = 610285^2 + 218164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420043312121 is a prime.

It is not a weakly prime, because it can be changed into another prime (420043312111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210021656060 + 210021656061.

It is an arithmetic number, because the mean of its divisors is an integer number (210021656061).

Almost surely, 2^420043312121 is an apocalyptic number.

It is an amenable number.

420043312121 is a deficient number, since it is larger than the sum of its proper divisors (1).

420043312121 is an equidigital number, since it uses as much as digits as its factorization.

420043312121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 420043312121 its reverse (121213340024), we get a palindrome (541256652145).

The spelling of 420043312121 in words is "four hundred twenty billion, forty-three million, three hundred twelve thousand, one hundred twenty-one".