1321211103 has 16 divisors (see below), whose sum is σ = 1897506816. Its totient is φ = 815332320.

The previous prime is 1321211093. The next prime is 1321211107. The reversal of 1321211103 is 3011121231.

It is a happy number.

It is not a de Polignac number, because 1321211103 - 2⁵ = 1321211071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321211107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306700 + ... + 310977.

It is an arithmetic number, because the mean of its divisors is an integer number (118594176).

Almost surely, 2^1321211103 is an apocalyptic number.

1321211103 is a deficient number, since it is larger than the sum of its proper divisors (576295713).

1321211103 is a wasteful number, since it uses less digits than its factorization.

1321211103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617734.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1321211103 is about 36348.4676843468. The cubic root of 1321211103 is about 1097.2966961002.

Adding to 1321211103 its reverse (3011121231), we get a palindrome (4332332334).

The spelling of 1321211103 in words is "one billion, three hundred twenty-one million, two hundred eleven thousand, one hundred three".