21011210103 has 12 divisors (see below), whose sum is σ = 30335712360. Its totient is φ = 12929975136.

The previous prime is 21011210063. The next prime is 21011210111. The reversal of 21011210103 is 30101211012.

It is not a de Polignac number, because 21011210103 - 2⁹ = 21011209591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011210113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20720608 + ... + 20721621.

It is an arithmetic number, because the mean of its divisors is an integer number (2527976030).

Almost surely, 2^21011210103 is an apocalyptic number.

21011210103 is a deficient number, since it is larger than the sum of its proper divisors (9324502257).

21011210103 is a wasteful number, since it uses less digits than its factorization.

21011210103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41442258 (or 41442245 counting only the distinct ones).

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

Adding to 21011210103 its reverse (30101211012), we get a palindrome (51112421115).

Subtracting 21011210103 from its reverse (30101211012), we obtain a palindrome (9090000909).

The spelling of 21011210103 in words is "twenty-one billion, eleven million, two hundred ten thousand, one hundred three".