420021003 has 16 divisors (see below), whose sum is σ = 577327616. Its totient is φ = 271421280.

The previous prime is 420020987. The next prime is 420021029. The reversal of 420021003 is 300120024.

It is not a de Polignac number, because 420021003 - 2⁴ = 420020987 is a prime.

It is a super-2 number, since 2×420021003² = 352835285922252018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420021003.

It is not an unprimeable number, because it can be changed into a prime (420021073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23100 + ... + 37062.

It is an arithmetic number, because the mean of its divisors is an integer number (36082976).

Almost surely, 2^420021003 is an apocalyptic number.

420021003 is a deficient number, since it is larger than the sum of its proper divisors (157306613).

420021003 is a wasteful number, since it uses less digits than its factorization.

420021003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14274.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 420021003 is about 20494.4139462440. The cubic root of 420021003 is about 748.8997217508.

Adding to 420021003 its reverse (300120024), we get a palindrome (720141027).

The spelling of 420021003 in words is "four hundred twenty million, twenty-one thousand, three".