21031032103 has 4 divisors (see below), whose sum is σ = 21125341888. Its totient is φ = 20936722320.

The previous prime is 21031032079. The next prime is 21031032119. The reversal of 21031032103 is 30123013012.

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 21031032103 - 2⁹ = 21031031591 is a prime.

It is a super-2 number, since 2×21031032103² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031032193) 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, 47154558 + ... + 47155003.

It is an arithmetic number, because the mean of its divisors is an integer number (5281335472).

Almost surely, 2^21031032103 is an apocalyptic number.

21031032103 is a deficient number, since it is larger than the sum of its proper divisors (94309785).

21031032103 is an equidigital number, since it uses as much as digits as its factorization.

21031032103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94309784.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21031032103 its reverse (30123013012), we get a palindrome (51154045115).

The spelling of 21031032103 in words is "twenty-one billion, thirty-one million, thirty-two thousand, one hundred three".