20121103 has 2 divisors, whose sum is σ = 20121104. Its totient is φ = 20121102.

The previous prime is 20121097. The next prime is 20121107. The reversal of 20121103 is 30112102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121103 - 2¹⁷ = 19990031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060551 + 10060552.

It is an arithmetic number, because the mean of its divisors is an integer number (10060552).

Almost surely, 2^20121103 is an apocalyptic number.

20121103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121103 is an equidigital number, since it uses as much as digits as its factorization.

20121103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20121103 is about 4485.6552475642. The cubic root of 20121103 is about 271.9885330734.

Adding to 20121103 its reverse (30112102), we get a palindrome (50233205).

Subtracting 20121103 from its reverse (30112102), we obtain a palindrome (9990999).

The spelling of 20121103 in words is "twenty million, one hundred twenty-one thousand, one hundred three".