420634121 has 2 divisors, whose sum is σ = 420634122. Its totient is φ = 420634120.

The previous prime is 420634117. The next prime is 420634139. The reversal of 420634121 is 121436024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382750096 + 37884025 = 19564^2 + 6155^2 .

It is a cyclic number.

It is not a de Polignac number, because 420634121 - 2² = 420634117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (420634021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210317060 + 210317061.

It is an arithmetic number, because the mean of its divisors is an integer number (210317061).

Almost surely, 2^420634121 is an apocalyptic number.

It is an amenable number.

420634121 is a deficient number, since it is larger than the sum of its proper divisors (1).

420634121 is an equidigital number, since it uses as much as digits as its factorization.

420634121 is an evil number, because the sum of its binary digits is even.

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

The square root of 420634121 is about 20509.3666650143. The cubic root of 420634121 is about 749.2639421577.

The spelling of 420634121 in words is "four hundred twenty million, six hundred thirty-four thousand, one hundred twenty-one".