210021210103 has 4 divisors (see below), whose sum is σ = 219152567088. Its totient is φ = 200889853120.

The previous prime is 210021210101. The next prime is 210021210107. The reversal of 210021210103 is 301012120012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 210021210103 - 2¹ = 210021210101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021210101) 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, 4565678458 + ... + 4565678503.

It is an arithmetic number, because the mean of its divisors is an integer number (54788141772).

Almost surely, 2^210021210103 is an apocalyptic number.

210021210103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

210021210103 is a deficient number, since it is larger than the sum of its proper divisors (9131356985).

210021210103 is an equidigital number, since it uses as much as digits as its factorization.

210021210103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9131356984.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 210021210103 its reverse (301012120012), we get a palindrome (511033330115).

Subtracting 210021210103 from its reverse (301012120012), we obtain a palindrome (90990909909).

The spelling of 210021210103 in words is "two hundred ten billion, twenty-one million, two hundred ten thousand, one hundred three".