1721521382 has 16 divisors (see below), whose sum is σ = 2999560992. Its totient is φ = 725699520.

The previous prime is 1721521369. The next prime is 1721521387. The reversal of 1721521382 is 2831251271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721521387) 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, 1007063 + ... + 1008770.

It is an arithmetic number, because the mean of its divisors is an integer number (187472562).

Almost surely, 2^1721521382 is an apocalyptic number.

1721521382 is a deficient number, since it is larger than the sum of its proper divisors (1278039610).

1721521382 is a wasteful number, since it uses less digits than its factorization.

1721521382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015903.

The product of its digits is 6720, while the sum is 32.

The square root of 1721521382 is about 41491.2205412181. The cubic root of 1721521382 is about 1198.4984417936.

The spelling of 1721521382 in words is "one billion, seven hundred twenty-one million, five hundred twenty-one thousand, three hundred eighty-two".