21010403003 has 4 divisors (see below), whose sum is σ = 22246309080. Its totient is φ = 19774496928.

The previous prime is 21010402993. The next prime is 21010403017. The reversal of 21010403003 is 30030401012.

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 21010403003 - 2¹² = 21010398907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010403023) 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, 617953013 + ... + 617953046.

It is an arithmetic number, because the mean of its divisors is an integer number (5561577270).

Almost surely, 2^21010403003 is an apocalyptic number.

21010403003 is a deficient number, since it is larger than the sum of its proper divisors (1235906077).

21010403003 is a wasteful number, since it uses less digits than its factorization.

21010403003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235906076.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21010403003 its reverse (30030401012), we get a palindrome (51040804015).

The spelling of 21010403003 in words is "twenty-one billion, ten million, four hundred three thousand, three".