1271721344 has 16 divisors (see below), whose sum is σ = 2533507620. Its totient is φ = 635860608.

The previous prime is 1271721337. The next prime is 1271721361. The reversal of 1271721344 is 4431271721.

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

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1271721344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4967534 + ... + 4967789.

Almost surely, 2^1271721344 is an apocalyptic number.

It is an amenable number.

1271721344 is a deficient number, since it is larger than the sum of its proper divisors (1261786276).

1271721344 is an frugal number, since it uses more digits than its factorization.

1271721344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9935337 (or 9935325 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 1271721344 is about 35661.2022231444. The cubic root of 1271721344 is about 1083.4211767086.

The spelling of 1271721344 in words is "one billion, two hundred seventy-one million, seven hundred twenty-one thousand, three hundred forty-four".