420400121 has 8 divisors (see below), whose sum is σ = 431491104. Its totient is φ = 409368960.

The previous prime is 420400117. The next prime is 420400171. The reversal of 420400121 is 121004024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420400121 - 2² = 420400117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420400096 and 420400105.

It is not an unprimeable number, because it can be changed into a prime (420400171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536 + ... + 29001.

It is an arithmetic number, because the mean of its divisors is an integer number (53936388).

Almost surely, 2^420400121 is an apocalyptic number.

It is an amenable number.

420400121 is a deficient number, since it is larger than the sum of its proper divisors (11090983).

420400121 is a wasteful number, since it uses less digits than its factorization.

420400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29911.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 420400121 is about 20503.6611608756. The cubic root of 420400121 is about 749.1249771400.

Adding to 420400121 its reverse (121004024), we get a palindrome (541404145).

The spelling of 420400121 in words is "four hundred twenty million, four hundred thousand, one hundred twenty-one".