420620361021 has 12 divisors (see below), whose sum is σ = 694357421472. Its totient is φ = 240354491976.

The previous prime is 420620360959. The next prime is 420620361047. The reversal of 420620361021 is 120163026024.

420620361021 is a `hidden beast` number, since 4 + 2 + 0 + 6 + 20 + 3 + 610 + 21 = 666.

It is not a de Polignac number, because 420620361021 - 2¹⁹ = 420619836733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420620361061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3338256771 + ... + 3338256896.

It is an arithmetic number, because the mean of its divisors is an integer number (57863118456).

Almost surely, 2^420620361021 is an apocalyptic number.

It is an amenable number.

420620361021 is a deficient number, since it is larger than the sum of its proper divisors (273737060451).

420620361021 is a wasteful number, since it uses less digits than its factorization.

420620361021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6676513680 (or 6676513677 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 420620361021 its reverse (120163026024), we get a palindrome (540783387045).

The spelling of 420620361021 in words is "four hundred twenty billion, six hundred twenty million, three hundred sixty-one thousand, twenty-one".