1211231310013 has 16 divisors (see below), whose sum is σ = 1326764502000. Its totient is φ = 1100622200832.

The previous prime is 1211231310011. The next prime is 1211231310017. The reversal of 1211231310013 is 3100131321121.

It can be written as a sum of positive squares in 8 ways, for example, as 30266604729 + 1180964705284 = 173973^2 + 1086722^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211231310013 - 2¹ = 1211231310011 is a prime.

It is a super-2 number, since 2×1211231310013² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211231310011) 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, 14535973 + ... + 14619061.

It is an arithmetic number, because the mean of its divisors is an integer number (82922781375).

Almost surely, 2^{1211231310013} is an apocalyptic number.

It is an amenable number.

1211231310013 is a deficient number, since it is larger than the sum of its proper divisors (115533191987).

1211231310013 is a wasteful number, since it uses less digits than its factorization.

1211231310013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112704.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1211231310013 its reverse (3100131321121), we get a palindrome (4311362631134).

The spelling of 1211231310013 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, three hundred ten thousand, thirteen".