1312311220203 has 16 divisors (see below), whose sum is σ = 1864040777856. Its totient is φ = 818359355520.

The previous prime is 1312311220183. The next prime is 1312311220261. The reversal of 1312311220203 is 3020221132131.

It is not a de Polignac number, because 1312311220203 - 2⁶ = 1312311220139 is a prime.

It is a super-2 number, since 2×1312311220203² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1312311220203.

It is not an unprimeable number, because it can be changed into a prime (1312311220903) 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, 78922953 + ... + 78939578.

It is an arithmetic number, because the mean of its divisors is an integer number (116502548616).

Almost surely, 2^{1312311220203} is an apocalyptic number.

1312311220203 is a deficient number, since it is larger than the sum of its proper divisors (551729557653).

1312311220203 is a wasteful number, since it uses less digits than its factorization.

1312311220203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157862714.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1312311220203 its reverse (3020221132131), we get a palindrome (4332532352334).

The spelling of 1312311220203 in words is "one trillion, three hundred twelve billion, three hundred eleven million, two hundred twenty thousand, two hundred three".