1321220103 has 32 divisors (see below), whose sum is σ = 2030976000. Its totient is φ = 748382976.

The previous prime is 1321220083. The next prime is 1321220111. The reversal of 1321220103 is 3010221231.

It is not a de Polignac number, because 1321220103 - 2⁵ = 1321220071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321220123) 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, 1708825 + ... + 1709597.

It is an arithmetic number, because the mean of its divisors is an integer number (63468000).

Almost surely, 2^1321220103 is an apocalyptic number.

1321220103 is a deficient number, since it is larger than the sum of its proper divisors (709755897).

1321220103 is a wasteful number, since it uses less digits than its factorization.

1321220103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1321220103 is about 36348.5914857784. The cubic root of 1321220103 is about 1097.2991876647.

Adding to 1321220103 its reverse (3010221231), we get a palindrome (4331441334).

The spelling of 1321220103 in words is "one billion, three hundred twenty-one million, two hundred twenty thousand, one hundred three".