1321013400043 has 4 divisors (see below), whose sum is σ = 1323539238808. Its totient is φ = 1318487561280.

The previous prime is 1321013399989. The next prime is 1321013400053. The reversal of 1321013400043 is 3400043101231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321013400043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321013399987 and 1321013400023.

It is not an unprimeable number, because it can be changed into a prime (1321013400053) 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, 1262918598 + ... + 1262919643.

It is an arithmetic number, because the mean of its divisors is an integer number (330884809702).

Almost surely, 2^{1321013400043} is an apocalyptic number.

1321013400043 is a deficient number, since it is larger than the sum of its proper divisors (2525838765).

1321013400043 is an equidigital number, since it uses as much as digits as its factorization.

1321013400043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525838764.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1321013400043 its reverse (3400043101231), we get a palindrome (4721056501274).

The spelling of 1321013400043 in words is "one trillion, three hundred twenty-one billion, thirteen million, four hundred thousand, forty-three".