21210110103 has 128 divisors (see below), whose sum is σ = 37617592320. Its totient is φ = 10329016320.

The previous prime is 21210110087. The next prime is 21210110111. The reversal of 21210110103 is 30101101212.

It is not a de Polignac number, because 21210110103 - 2⁴ = 21210110087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210110143) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 17868076 + ... + 17869262.

It is an arithmetic number, because the mean of its divisors is an integer number (293887440).

Almost surely, 2^21210110103 is an apocalyptic number.

21210110103 is a deficient number, since it is larger than the sum of its proper divisors (16407482217).

21210110103 is a wasteful number, since it uses less digits than its factorization.

21210110103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337.

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

Adding to 21210110103 its reverse (30101101212), we get a palindrome (51311211315).

The spelling of 21210110103 in words is "twenty-one billion, two hundred ten million, one hundred ten thousand, one hundred three".