21221222103 has 16 divisors (see below), whose sum is σ = 32205650400. Its totient is φ = 13802420160.

The previous prime is 21221222083. The next prime is 21221222123. The reversal of 21221222103 is 30122212212.

It is an interprime number because it is at equal distance from previous prime (21221222083) and next prime (21221222123).

It is not a de Polignac number, because 21221222103 - 2¹⁰ = 21221221079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221222123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9583908 + ... + 9586121.

It is an arithmetic number, because the mean of its divisors is an integer number (2012853150).

Almost surely, 2^21221222103 is an apocalyptic number.

21221222103 is a deficient number, since it is larger than the sum of its proper divisors (10984428297).

21221222103 is a wasteful number, since it uses less digits than its factorization.

21221222103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19170079 (or 19170073 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21221222103 its reverse (30122212212), we get a palindrome (51343434315).

The spelling of 21221222103 in words is "twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred three".