1709143040921 has 4 divisors (see below), whose sum is σ = 1709181507792. Its totient is φ = 1709104574052.

The previous prime is 1709143040909. The next prime is 1709143040947. The reversal of 1709143040921 is 1290403419071.

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-1709143040921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1709143040951) 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, 19166711 + ... + 19255676.

It is an arithmetic number, because the mean of its divisors is an integer number (427295376948).

Almost surely, 2^{1709143040921} is an apocalyptic number.

It is an amenable number.

1709143040921 is a deficient number, since it is larger than the sum of its proper divisors (38466871).

1709143040921 is an equidigital number, since it uses as much as digits as its factorization.

1709143040921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38466870.

The product of its (nonzero) digits is 54432, while the sum is 41.

Adding to 1709143040921 its reverse (1290403419071), we get a palindrome (2999546459992).

The spelling of 1709143040921 in words is "one trillion, seven hundred nine billion, one hundred forty-three million, forty thousand, nine hundred twenty-one".