21213122103 has 48 divisors (see below), whose sum is σ = 32414314240. Its totient is φ = 13703818464.

The previous prime is 21213122069. The next prime is 21213122167. The reversal of 21213122103 is 30122131212.

It is not a de Polignac number, because 21213122103 - 2¹⁰ = 21213121079 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 (21213122173) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25774950 + ... + 25775772.

Almost surely, 2^21213122103 is an apocalyptic number.

21213122103 is a deficient number, since it is larger than the sum of its proper divisors (11201192137).

21213122103 is an equidigital number, since it uses as much as digits as its factorization.

21213122103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1018 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21213122103 its reverse (30122131212), we get a palindrome (51335253315).

The spelling of 21213122103 in words is "twenty-one billion, two hundred thirteen million, one hundred twenty-two thousand, one hundred three".