21021122103 has 32 divisors (see below), whose sum is σ = 29300275200. Its totient is φ = 13390202880.

The previous prime is 21021122071. The next prime is 21021122137. The reversal of 21021122103 is 30122112012.

It is not a de Polignac number, because 21021122103 - 2⁵ = 21021122071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021122173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4120048 + ... + 4125146.

It is an arithmetic number, because the mean of its divisors is an integer number (915633600).

Almost surely, 2^21021122103 is an apocalyptic number.

21021122103 is a deficient number, since it is larger than the sum of its proper divisors (8279153097).

21021122103 is a wasteful number, since it uses less digits than its factorization.

21021122103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5687.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21021122103 its reverse (30122112012), we get a palindrome (51143234115).

The spelling of 21021122103 in words is "twenty-one billion, twenty-one million, one hundred twenty-two thousand, one hundred three".