1321011275731 has 32 divisors (see below), whose sum is σ = 1595615720960. Its totient is φ = 1068369958656.

The previous prime is 1321011275713. The next prime is 1321011275741. The reversal of 1321011275731 is 1375721101231.

It is not a de Polignac number, because 1321011275731 - 2⁵ = 1321011275699 is a prime.

It is a super-2 number, since 2×1321011275731² (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 (1321011275741) 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, 33227341 + ... + 33267073.

It is an arithmetic number, because the mean of its divisors is an integer number (49862991280).

Almost surely, 2^{1321011275731} is an apocalyptic number.

1321011275731 is a deficient number, since it is larger than the sum of its proper divisors (274604445229).

1321011275731 is a wasteful number, since it uses less digits than its factorization.

1321011275731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40763.

The product of its (nonzero) digits is 8820, while the sum is 34.

Adding to 1321011275731 its reverse (1375721101231), we get a palindrome (2696732376962).

The spelling of 1321011275731 in words is "one trillion, three hundred twenty-one billion, eleven million, two hundred seventy-five thousand, seven hundred thirty-one".