1311302021 has 16 divisors (see below), whose sum is σ = 1420416000. Its totient is φ = 1205832960.

The previous prime is 1311302017. The next prime is 1311302029. The reversal of 1311302021 is 1202031131.

It is a cyclic number.

It is not a de Polignac number, because 1311302021 - 2² = 1311302017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311301987 and 1311302005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311302029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 654980 + ... + 656978.

It is an arithmetic number, because the mean of its divisors is an integer number (88776000).

Almost surely, 2^1311302021 is an apocalyptic number.

It is an amenable number.

1311302021 is a deficient number, since it is larger than the sum of its proper divisors (109113979).

1311302021 is a wasteful number, since it uses less digits than its factorization.

1311302021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1311302021 is about 36211.9044100141. The cubic root of 1311302021 is about 1094.5465678906.

Adding to 1311302021 its reverse (1202031131), we get a palindrome (2513333152).

The spelling of 1311302021 in words is "one billion, three hundred eleven million, three hundred two thousand, twenty-one".