1001321011231 has 16 divisors (see below), whose sum is σ = 1032064891200. Its totient is φ = 971191001088.

The previous prime is 1001321011177. The next prime is 1001321011241. The reversal of 1001321011231 is 1321101231001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1001321011231 - 2¹⁷ = 1001320880159 is a prime.

It is a super-2 number, since 2×1001321011231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001321011241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462310 + ... + 1488748.

It is an arithmetic number, because the mean of its divisors is an integer number (64504055700).

Almost surely, 2^{1001321011231} is an apocalyptic number.

1001321011231 is a deficient number, since it is larger than the sum of its proper divisors (30743879969).

1001321011231 is a wasteful number, since it uses less digits than its factorization.

1001321011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026738.

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

Adding to 1001321011231 its reverse (1321101231001), we get a palindrome (2322422242232).

The spelling of 1001321011231 in words is "one trillion, one billion, three hundred twenty-one million, eleven thousand, two hundred thirty-one".