1311233223021 has 32 divisors (see below), whose sum is σ = 1787778293760. Its totient is φ = 854645697984.

The previous prime is 1311233223017. The next prime is 1311233223089. The reversal of 1311233223021 is 1203223321131.

It is not a de Polignac number, because 1311233223021 - 2² = 1311233223017 is a prime.

It is a super-3 number, since 3×1311233223021³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311233222982 and 1311233223000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311233221021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64477771 + ... + 64498103.

It is an arithmetic number, because the mean of its divisors is an integer number (55868071680).

Almost surely, 2^{1311233223021} is an apocalyptic number.

It is an amenable number.

1311233223021 is a deficient number, since it is larger than the sum of its proper divisors (476545070739).

1311233223021 is a wasteful number, since it uses less digits than its factorization.

1311233223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23065.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1311233223021 its reverse (1203223321131), we get a palindrome (2514456544152).

The spelling of 1311233223021 in words is "one trillion, three hundred eleven billion, two hundred thirty-three million, two hundred twenty-three thousand, twenty-one".