420521273 has 2 divisors, whose sum is σ = 420521274. Its totient is φ = 420521272.

The previous prime is 420521263. The next prime is 420521327. The reversal of 420521273 is 372125024.

Together with next prime (420521327) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319980544 + 100540729 = 17888^2 + 10027^2 .

It is a cyclic number.

It is not a de Polignac number, because 420521273 - 2²⁴ = 403744057 is a prime.

It is not a weakly prime, because it can be changed into another prime (420521263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210260636 + 210260637.

It is an arithmetic number, because the mean of its divisors is an integer number (210260637).

Almost surely, 2^420521273 is an apocalyptic number.

It is an amenable number.

420521273 is a deficient number, since it is larger than the sum of its proper divisors (1).

420521273 is an equidigital number, since it uses as much as digits as its factorization.

420521273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 420521273 is about 20506.6153472483. The cubic root of 420521273 is about 749.1969318230.

Adding to 420521273 its reverse (372125024), we get a palindrome (792646297).

The spelling of 420521273 in words is "four hundred twenty million, five hundred twenty-one thousand, two hundred seventy-three".