420421021403 has 4 divisors (see below), whose sum is σ = 421263549000. Its totient is φ = 419578493808.

The previous prime is 420421021387. The next prime is 420421021409. The reversal of 420421021403 is 304120124024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420421021403 - 2⁴ = 420421021387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420421021409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421263050 + ... + 421264047.

It is an arithmetic number, because the mean of its divisors is an integer number (105315887250).

Almost surely, 2^420421021403 is an apocalyptic number.

420421021403 is a deficient number, since it is larger than the sum of its proper divisors (842527597).

420421021403 is an equidigital number, since it uses as much as digits as its factorization.

420421021403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842527596.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 420421021403 its reverse (304120124024), we get a palindrome (724541145427).

The spelling of 420421021403 in words is "four hundred twenty billion, four hundred twenty-one million, twenty-one thousand, four hundred three".