1721144427 has 8 divisors (see below), whose sum is σ = 2296625664. Its totient is φ = 1146546408.

The previous prime is 1721144407. The next prime is 1721144449. The reversal of 1721144427 is 7244411271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1721144427 - 2²⁰ = 1720095851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1721144407) 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, 216243 + ... + 224060.

It is an arithmetic number, because the mean of its divisors is an integer number (287078208).

Almost surely, 2^1721144427 is an apocalyptic number.

1721144427 is a deficient number, since it is larger than the sum of its proper divisors (575481237).

1721144427 is a wasteful number, since it uses less digits than its factorization.

1721144427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441609.

The product of its digits is 12544, while the sum is 33.

The square root of 1721144427 is about 41486.6777050175. The cubic root of 1721144427 is about 1198.4109585237.

Adding to 1721144427 its reverse (7244411271), we get a palindrome (8965555698).

The spelling of 1721144427 in words is "one billion, seven hundred twenty-one million, one hundred forty-four thousand, four hundred twenty-seven".