420423121 has 16 divisors (see below), whose sum is σ = 440352000. Its totient is φ = 400897728.

The previous prime is 420423077. The next prime is 420423139. The reversal of 420423121 is 121324024.

It is a cyclic number.

It is not a de Polignac number, because 420423121 - 2¹¹ = 420421073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420423151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1517635 + ... + 1517911.

It is an arithmetic number, because the mean of its divisors is an integer number (27522000).

Almost surely, 2^420423121 is an apocalyptic number.

It is an amenable number.

420423121 is a deficient number, since it is larger than the sum of its proper divisors (19928879).

420423121 is a wasteful number, since it uses less digits than its factorization.

420423121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 420423121 is about 20504.2220286457. Note that the first 3 decimals coincide. The cubic root of 420423121 is about 749.1386383795.

Adding to 420423121 its reverse (121324024), we get a palindrome (541747145).

The spelling of 420423121 in words is "four hundred twenty million, four hundred twenty-three thousand, one hundred twenty-one".