1721001671072 has 48 divisors (see below), whose sum is σ = 3606117673032. Its totient is φ = 805686804480.

The previous prime is 1721001671063. The next prime is 1721001671083. The reversal of 1721001671072 is 2701761001271.

It can be written as a sum of positive squares in 4 ways, for example, as 1460530258576 + 260471412496 = 1208524^2 + 510364^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8090879 + ... + 8300862.

Almost surely, 2^{1721001671072} is an apocalyptic number.

It is an amenable number.

1721001671072 is an abundant number, since it is smaller than the sum of its proper divisors (1885116001960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721001671072 is a wasteful number, since it uses less digits than its factorization.

1721001671072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16391961 (or 16391953 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 35.

The spelling of 1721001671072 in words is "one trillion, seven hundred twenty-one billion, one million, six hundred seventy-one thousand, seventy-two".