1721573073243 has 12 divisors (see below), whose sum is σ = 2488317915720. Its totient is φ = 1146976341696.

The previous prime is 1721573073239. The next prime is 1721573073289. The reversal of 1721573073243 is 3423703751271.

1721573073243 is a `hidden beast` number, since 1 + 7 + 2 + 1 + 573 + 0 + 7 + 32 + 43 = 666.

It is not a de Polignac number, because 1721573073243 - 2² = 1721573073239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1721573073043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61571953 + ... + 61599906.

It is an arithmetic number, because the mean of its divisors is an integer number (207359826310).

Almost surely, 2^{1721573073243} is an apocalyptic number.

1721573073243 is a deficient number, since it is larger than the sum of its proper divisors (766744842477).

1721573073243 is a wasteful number, since it uses less digits than its factorization.

1721573073243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123173418 (or 123173415 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 45.

The spelling of 1721573073243 in words is "one trillion, seven hundred twenty-one billion, five hundred seventy-three million, seventy-three thousand, two hundred forty-three".