1321001021131 has 12 divisors (see below), whose sum is σ = 1466385730992. Its totient is φ = 1189019810000.

The previous prime is 1321001021129. The next prime is 1321001021149. The reversal of 1321001021131 is 1311201001231.

It is a happy number.

It is not a de Polignac number, because 1321001021131 - 2¹ = 1321001021129 is a prime.

It is a super-2 number, since 2×1321001021131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321001051131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54034135 + ... + 54058576.

It is an arithmetic number, because the mean of its divisors is an integer number (122198810916).

Almost surely, 2^{1321001021131} is an apocalyptic number.

1321001021131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321001021131 is a deficient number, since it is larger than the sum of its proper divisors (145384709861).

1321001021131 is a wasteful number, since it uses less digits than its factorization.

1321001021131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108092834 (or 108092823 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1321001021131 its reverse (1311201001231), we get a palindrome (2632202022362).

The spelling of 1321001021131 in words is "one trillion, three hundred twenty-one billion, one million, twenty-one thousand, one hundred thirty-one".