1312221021131 has 4 divisors (see below), whose sum is σ = 1312253636472. Its totient is φ = 1312188405792.

The previous prime is 1312221021109. The next prime is 1312221021179. The reversal of 1312221021131 is 1311201222131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1312221021131 - 2²² = 1312216826827 is a prime.

It is a super-2 number, since 2×1312221021131² (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 (1312221221131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16247246 + ... + 16327811.

It is an arithmetic number, because the mean of its divisors is an integer number (328063409118).

Almost surely, 2^{1312221021131} is an apocalyptic number.

1312221021131 is a deficient number, since it is larger than the sum of its proper divisors (32615341).

1312221021131 is an equidigital number, since it uses as much as digits as its factorization.

1312221021131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32615340.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1312221021131 its reverse (1311201222131), we get a palindrome (2623422243262).

The spelling of 1312221021131 in words is "one trillion, three hundred twelve billion, two hundred twenty-one million, twenty-one thousand, one hundred thirty-one".