420020121023 has 2 divisors, whose sum is σ = 420020121024. Its totient is φ = 420020121022.

The previous prime is 420020121019. The next prime is 420020121041. The reversal of 420020121023 is 320121020024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420020121023 - 2² = 420020121019 is a prime.

It is a super-5 number, since 5×420020121023⁵ (a number of 59 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 420020120992 and 420020121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420020121083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210010060511 + 210010060512.

It is an arithmetic number, because the mean of its divisors is an integer number (210010060512).

Almost surely, 2^420020121023 is an apocalyptic number.

420020121023 is a deficient number, since it is larger than the sum of its proper divisors (1).

420020121023 is an equidigital number, since it uses as much as digits as its factorization.

420020121023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 420020121023 its reverse (320121020024), we get a palindrome (740141141047).

It can be divided in two parts, 4200201 and 21023, that added together give a palindrome (4221224).

The spelling of 420020121023 in words is "four hundred twenty billion, twenty million, one hundred twenty-one thousand, twenty-three".