1321670761231 has 4 divisors (see below), whose sum is σ = 1323407517264. Its totient is φ = 1319934005200.

The previous prime is 1321670761219. The next prime is 1321670761241.

1321670761231 is nontrivially palindromic in base 10.

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 1321670761231 - 2²¹ = 1321668664079 is a prime.

It is a super-2 number, since 2×1321670761231² (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 (1321670761241) 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, 868376875 + ... + 868378396.

It is an arithmetic number, because the mean of its divisors is an integer number (330851879316).

Almost surely, 2^{1321670761231} is an apocalyptic number.

1321670761231 is a deficient number, since it is larger than the sum of its proper divisors (1736756033).

1321670761231 is an equidigital number, since it uses as much as digits as its factorization.

1321670761231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736756032.

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 1321670761231 in words is "one trillion, three hundred twenty-one billion, six hundred seventy million, seven hundred sixty-one thousand, two hundred thirty-one".