420128621 has 8 divisors (see below), whose sum is σ = 458474688. Its totient is φ = 381808000.

The previous prime is 420128617. The next prime is 420128663. The reversal of 420128621 is 126821024.

It is a happy number.

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 420128621 - 2² = 420128617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420128671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49661 + ... + 57501.

It is an arithmetic number, because the mean of its divisors is an integer number (57309336).

Almost surely, 2^420128621 is an apocalyptic number.

It is an amenable number.

420128621 is a deficient number, since it is larger than the sum of its proper divisors (38346067).

420128621 is a wasteful number, since it uses less digits than its factorization.

420128621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12723.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 420128621 is about 20497.0393227900. The cubic root of 420128621 is about 748.9636774477.

Adding to 420128621 its reverse (126821024), we get a palindrome (546949645).

The spelling of 420128621 in words is "four hundred twenty million, one hundred twenty-eight thousand, six hundred twenty-one".