420021004 has 24 divisors (see below), whose sum is σ = 797823488. Its totient is φ = 192326400.

The previous prime is 420020987. The next prime is 420021029. The reversal of 420021004 is 400120024.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25197 + ... + 38404.

Almost surely, 2^420021004 is an apocalyptic number.

It is an amenable number.

420021004 is a deficient number, since it is larger than the sum of its proper divisors (377802484).

420021004 is a wasteful number, since it uses less digits than its factorization.

420021004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63745 (or 63743 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 420021004 is about 20494.4139706409. The cubic root of 420021004 is about 748.8997223452.

Adding to 420021004 its reverse (400120024), we get a palindrome (820141028).

The spelling of 420021004 in words is "four hundred twenty million, twenty-one thousand, four".