1311241122021 has 16 divisors (see below), whose sum is σ = 1791225596160. Its totient is φ = 852714938880.

The previous prime is 1311241122001. The next prime is 1311241122047. The reversal of 1311241122021 is 1202211421131.

It is not a de Polignac number, because 1311241122021 - 2³¹ = 1309093638373 is a prime.

It is a super-2 number, since 2×1311241122021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311241122001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67485 + ... + 1620813.

It is an arithmetic number, because the mean of its divisors is an integer number (111951599760).

Almost surely, 2^{1311241122021} is an apocalyptic number.

It is an amenable number.

1311241122021 is a deficient number, since it is larger than the sum of its proper divisors (479984474139).

1311241122021 is a wasteful number, since it uses less digits than its factorization.

1311241122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560236.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 1311241122021 its reverse (1202211421131), we get a palindrome (2513452543152).

The spelling of 1311241122021 in words is "one trillion, three hundred eleven billion, two hundred forty-one million, one hundred twenty-two thousand, twenty-one".