21002222103 has 16 divisors (see below), whose sum is σ = 28632500736. Its totient is φ = 13689462240.

The previous prime is 21002222099. The next prime is 21002222123. The reversal of 21002222103 is 30122220012.

It is a happy number.

It is not a de Polignac number, because 21002222103 - 2² = 21002222099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002222123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313051 + ... + 374172.

It is an arithmetic number, because the mean of its divisors is an integer number (1789531296).

Almost surely, 2^21002222103 is an apocalyptic number.

21002222103 is a deficient number, since it is larger than the sum of its proper divisors (7630278633).

21002222103 is a wasteful number, since it uses less digits than its factorization.

21002222103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687454.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21002222103 its reverse (30122220012), we get a palindrome (51124442115).

The spelling of 21002222103 in words is "twenty-one billion, two million, two hundred twenty-two thousand, one hundred three".