420020121 has 16 divisors (see below), whose sum is σ = 563967360. Its totient is φ = 278050560.

The previous prime is 420020077. The next prime is 420020131. The reversal of 420020121 is 121020024.

It is not a de Polignac number, because 420020121 - 2⁶ = 420020057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420020097 and 420020106.

It is not an unprimeable number, because it can be changed into a prime (420020131) 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, 406876 + ... + 407906.

It is an arithmetic number, because the mean of its divisors is an integer number (35247960).

Almost surely, 2^420020121 is an apocalyptic number.

It is an amenable number.

420020121 is a deficient number, since it is larger than the sum of its proper divisors (143947239).

420020121 is a wasteful number, since it uses less digits than its factorization.

420020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 420020121 is about 20494.3924281741. The cubic root of 420020121 is about 748.8991975469.

Adding to 420020121 its reverse (121020024), we get a palindrome (541040145).

The spelling of 420020121 in words is "four hundred twenty million, twenty thousand, one hundred twenty-one".