21000023103 has 16 divisors (see below), whose sum is σ = 28534952160. Its totient is φ = 13732677504.

The previous prime is 21000023071. The next prime is 21000023111. The reversal of 21000023103 is 30132000012.

It is a happy number.

It is not a de Polignac number, because 21000023103 - 2⁵ = 21000023071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000023183) 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, 812325 + ... + 837777.

It is an arithmetic number, because the mean of its divisors is an integer number (1783434510).

Almost surely, 2^21000023103 is an apocalyptic number.

21000023103 is a deficient number, since it is larger than the sum of its proper divisors (7534929057).

21000023103 is a wasteful number, since it uses less digits than its factorization.

21000023103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30698.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21000023103 its reverse (30132000012), we get a palindrome (51132023115).

The spelling of 21000023103 in words is "twenty-one billion, twenty-three thousand, one hundred three".