420210121 has 2 divisors, whose sum is σ = 420210122. Its totient is φ = 420210120.

The previous prime is 420210113. The next prime is 420210139. The reversal of 420210121 is 121012024.

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., 239011600 + 181198521 = 15460^2 + 13461^2 .

It is a cyclic number.

It is not a de Polignac number, because 420210121 - 2³ = 420210113 is a prime.

It is not a weakly prime, because it can be changed into another prime (420210101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210105060 + 210105061.

It is an arithmetic number, because the mean of its divisors is an integer number (210105061).

Almost surely, 2^420210121 is an apocalyptic number.

It is an amenable number.

420210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

420210121 is an equidigital number, since it uses as much as digits as its factorization.

420210121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 420210121 is about 20499.0273183876. The cubic root of 420210121 is about 749.0121043580.

Adding to 420210121 its reverse (121012024), we get a palindrome (541222145).

The spelling of 420210121 in words is "four hundred twenty million, two hundred ten thousand, one hundred twenty-one".