1721105536 has 16 divisors (see below), whose sum is σ = 3428765190. Its totient is φ = 860552704.

The previous prime is 1721105521. The next prime is 1721105537. The reversal of 1721105536 is 6355011271.

It can be written as a sum of positive squares in only one way, i.e., 1300035136 + 421070400 = 36056^2 + 20520^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1721105498 and 1721105507.

It is not an unprimeable number, because it can be changed into a prime (1721105537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6722941 + ... + 6723196.

Almost surely, 2^1721105536 is an apocalyptic number.

1721105536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1721105536 is a deficient number, since it is larger than the sum of its proper divisors (1707659654).

1721105536 is an equidigital number, since it uses as much as digits as its factorization.

1721105536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13446151 (or 13446139 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 1721105536 is about 41486.2089856376. The cubic root of 1721105536 is about 1198.4019320196.

The spelling of 1721105536 in words is "one billion, seven hundred twenty-one million, one hundred five thousand, five hundred thirty-six".