21420304003 has 16 divisors (see below), whose sum is σ = 25008113664. Its totient is φ = 17964652320.

The previous prime is 21420303979. The next prime is 21420304007. The reversal of 21420304003 is 30040302412.

It is a cyclic number.

It is not a de Polignac number, because 21420304003 - 2²¹ = 21418206851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21420304007) 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, 1645426 + ... + 1658392.

It is an arithmetic number, because the mean of its divisors is an integer number (1563007104).

Almost surely, 2^21420304003 is an apocalyptic number.

21420304003 is a deficient number, since it is larger than the sum of its proper divisors (3587809661).

21420304003 is a wasteful number, since it uses less digits than its factorization.

21420304003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18042.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21420304003 its reverse (30040302412), we get a palindrome (51460606415).

The spelling of 21420304003 in words is "twenty-one billion, four hundred twenty million, three hundred four thousand, three".