1389041163821 has 4 divisors (see below), whose sum is σ = 1389138949632. Its totient is φ = 1388943378012.

The previous prime is 1389041163799. The next prime is 1389041163871. The reversal of 1389041163821 is 1283611409831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389041163821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389041163871) 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, 48871595 + ... + 48900008.

It is an arithmetic number, because the mean of its divisors is an integer number (347284737408).

Almost surely, 2^{1389041163821} is an apocalyptic number.

It is an amenable number.

1389041163821 is a deficient number, since it is larger than the sum of its proper divisors (97785811).

1389041163821 is an equidigital number, since it uses as much as digits as its factorization.

1389041163821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97785810.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 1389041163821 in words is "one trillion, three hundred eighty-nine billion, forty-one million, one hundred sixty-three thousand, eight hundred twenty-one".