1721328787113 has 8 divisors (see below), whose sum is σ = 2471651591808. Its totient is φ = 1059279253584.

The previous prime is 1721328787111. The next prime is 1721328787141. The reversal of 1721328787113 is 3117878231271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1721328787113 - 2¹ = 1721328787111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1721328787111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22068317745 + ... + 22068317822.

It is an arithmetic number, because the mean of its divisors is an integer number (308956448976).

Almost surely, 2^{1721328787113} is an apocalyptic number.

1721328787113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1721328787113 is a deficient number, since it is larger than the sum of its proper divisors (750322804695).

1721328787113 is a wasteful number, since it uses less digits than its factorization.

1721328787113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44136635583.

The product of its digits is 790272, while the sum is 51.

The spelling of 1721328787113 in words is "one trillion, seven hundred twenty-one billion, three hundred twenty-eight million, seven hundred eighty-seven thousand, one hundred thirteen".