1721081232 has 60 divisors (see below), whose sum is σ = 5187153244. Its totient is φ = 529562880.

The previous prime is 1721081221. The next prime is 1721081261. The reversal of 1721081232 is 2321801271.

It can be written as a sum of positive squares in 2 ways, for example, as 414692496 + 1306388736 = 20364^2 + 36144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1721081196 and 1721081205.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 457819 + ... + 461562.

Almost surely, 2^1721081232 is an apocalyptic number.

1721081232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1721081232 is an abundant number, since it is smaller than the sum of its proper divisors (3466072012).

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

1721081232 is a wasteful number, since it uses less digits than its factorization.

1721081232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919408 (or 919399 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1721081232 is about 41485.9160679863. The cubic root of 1721081232 is about 1198.3962910528.

The spelling of 1721081232 in words is "one billion, seven hundred twenty-one million, eighty-one thousand, two hundred thirty-two".