1213121103 has 8 divisors (see below), whose sum is σ = 1617686448. Its totient is φ = 808651584.

The previous prime is 1213121099. The next prime is 1213121113. The reversal of 1213121103 is 3011213121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213121103 - 2² = 1213121099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213121113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14325 + ... + 51297.

It is an arithmetic number, because the mean of its divisors is an integer number (202210806).

Almost surely, 2^1213121103 is an apocalyptic number.

1213121103 is a deficient number, since it is larger than the sum of its proper divisors (404565345).

1213121103 is a wasteful number, since it uses less digits than its factorization.

1213121103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47913.

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

The square root of 1213121103 is about 34829.8880704489. Note that the first 3 decimals coincide. The cubic root of 1213121103 is about 1066.5176634423.

Adding to 1213121103 its reverse (3011213121), we get a palindrome (4224334224).

The spelling of 1213121103 in words is "one billion, two hundred thirteen million, one hundred twenty-one thousand, one hundred three".