420113021 has 2 divisors, whose sum is σ = 420113022. Its totient is φ = 420113020.

The previous prime is 420113011. The next prime is 420113041. The reversal of 420113021 is 120311024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247716121 + 172396900 = 15739^2 + 13130^2 .

It is a cyclic number.

It is not a de Polignac number, because 420113021 - 2²² = 415918717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420112987 and 420113005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420113011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210056510 + 210056511.

It is an arithmetic number, because the mean of its divisors is an integer number (210056511).

Almost surely, 2^420113021 is an apocalyptic number.

It is an amenable number.

420113021 is a deficient number, since it is larger than the sum of its proper divisors (1).

420113021 is an equidigital number, since it uses as much as digits as its factorization.

420113021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 420113021 is about 20496.6587764933. The cubic root of 420113021 is about 748.9544072882.

Adding to 420113021 its reverse (120311024), we get a palindrome (540424045).

The spelling of 420113021 in words is "four hundred twenty million, one hundred thirteen thousand, twenty-one".