1211312103 has 8 divisors (see below), whose sum is σ = 1620596208. Its totient is φ = 804784704.

The previous prime is 1211312099. The next prime is 1211312131. The reversal of 1211312103 is 3012131121.

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 1211312103 - 2² = 1211312099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211312143) 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, 688150 + ... + 689907.

It is an arithmetic number, because the mean of its divisors is an integer number (202574526).

Almost surely, 2^1211312103 is an apocalyptic number.

1211312103 is a deficient number, since it is larger than the sum of its proper divisors (409284105).

1211312103 is a wasteful number, since it uses less digits than its factorization.

1211312103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378353.

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

The square root of 1211312103 is about 34803.9093062834. The cubic root of 1211312103 is about 1065.9872711491.

Adding to 1211312103 its reverse (3012131121), we get a palindrome (4223443224).

The spelling of 1211312103 in words is "one billion, two hundred eleven million, three hundred twelve thousand, one hundred three".