1216201103 has 16 divisors (see below), whose sum is σ = 1350038592. Its totient is φ = 1088640000.

The previous prime is 1216201099. The next prime is 1216201111. The reversal of 1216201103 is 3011026121.

It is a cyclic number.

It is not a de Polignac number, because 1216201103 - 2² = 1216201099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216201183) 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, 45503 + ... + 67103.

It is an arithmetic number, because the mean of its divisors is an integer number (84377412).

Almost surely, 2^1216201103 is an apocalyptic number.

1216201103 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1216201103 is a deficient number, since it is larger than the sum of its proper divisors (133837489).

1216201103 is a wasteful number, since it uses less digits than its factorization.

1216201103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21746.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1216201103 is about 34874.0749411364. The cubic root of 1216201103 is about 1067.4194965499.

Adding to 1216201103 its reverse (3011026121), we get a palindrome (4227227224).

The spelling of 1216201103 in words is "one billion, two hundred sixteen million, two hundred one thousand, one hundred three".