420506621 has 8 divisors (see below), whose sum is σ = 425224800. Its totient is φ = 415815120.

The previous prime is 420506609. The next prime is 420506623. The reversal of 420506621 is 126605024.

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 420506621 - 2⁶ = 420506557 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 (420506623) 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, 25910 + ... + 38888.

It is an arithmetic number, because the mean of its divisors is an integer number (53153100).

Almost surely, 2^420506621 is an apocalyptic number.

It is an amenable number.

420506621 is a deficient number, since it is larger than the sum of its proper divisors (4718179).

420506621 is a wasteful number, since it uses less digits than its factorization.

420506621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13339.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 420506621 is about 20506.2580935674. The cubic root of 420506621 is about 749.1882304313.

The spelling of 420506621 in words is "four hundred twenty million, five hundred six thousand, six hundred twenty-one".