21210023103 has 32 divisors (see below), whose sum is σ = 30195590400. Its totient is φ = 13220503296.

The previous prime is 21210023099. The next prime is 21210023111. The reversal of 21210023103 is 30132001212.

It is not a de Polignac number, because 21210023103 - 2² = 21210023099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210023143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313075 + ... + 374747.

It is an arithmetic number, because the mean of its divisors is an integer number (943612200).

Almost surely, 2^21210023103 is an apocalyptic number.

21210023103 is a deficient number, since it is larger than the sum of its proper divisors (8985567297).

21210023103 is a wasteful number, since it uses less digits than its factorization.

21210023103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61831.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21210023103 its reverse (30132001212), we get a palindrome (51342024315).

The spelling of 21210023103 in words is "twenty-one billion, two hundred ten million, twenty-three thousand, one hundred three".