420540121 has 2 divisors, whose sum is σ = 420540122. Its totient is φ = 420540120.

The previous prime is 420540097. The next prime is 420540143. The reversal of 420540121 is 121045024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 407838025 + 12702096 = 20195^2 + 3564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420540121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420540221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210270060 + 210270061.

It is an arithmetic number, because the mean of its divisors is an integer number (210270061).

Almost surely, 2^420540121 is an apocalyptic number.

It is an amenable number.

420540121 is a deficient number, since it is larger than the sum of its proper divisors (1).

420540121 is an equidigital number, since it uses as much as digits as its factorization.

420540121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 420540121 is about 20507.0749011164. The cubic root of 420540121 is about 749.2081247984.

Adding to 420540121 its reverse (121045024), we get a palindrome (541585145).

The spelling of 420540121 in words is "four hundred twenty million, five hundred forty thousand, one hundred twenty-one".