21121223222103 has 16 divisors (see below), whose sum is σ = 28504051443840. Its totient is φ = 13909642428384.

The previous prime is 21121223222053. The next prime is 21121223222111. The reversal of 21121223222103 is 30122232212112.

It is not a de Polignac number, because 21121223222103 - 2²¹ = 21121221124951 is a prime.

It is a super-2 number, since 2×21121223222103² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121223232103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2369713 + ... + 6917946.

It is an arithmetic number, because the mean of its divisors is an integer number (1781503215240).

Almost surely, 2^{21121223222103} is an apocalyptic number.

21121223222103 is a deficient number, since it is larger than the sum of its proper divisors (7382828221737).

21121223222103 is an equidigital number, since it uses as much as digits as its factorization.

21121223222103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9296878.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21121223222103 its reverse (30122232212112), we get a palindrome (51243455434215).

The spelling of 21121223222103 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-three million, two hundred twenty-two thousand, one hundred three".