1721337121 has 9 divisors (see below), whose sum is σ = 2002709649. Its totient is φ = 1475182884.

The previous prime is 1721337109. The next prime is 1721337131. The reversal of 1721337121 is 1217331271.

The square root of 1721337121 is 41489.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1721337121 - 2²³ = 1712948513 is a prime.

It is a super-3 number, since 3×1721337121³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1721337121.

It is not an unprimeable number, because it can be changed into a prime (1721337131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 287460 + ... + 293386.

Almost surely, 2^1721337121 is an apocalyptic number.

1721337121 is the 41489-th square number.

1721337121 is the 20745-th centered octagonal number.

It is an amenable number.

1721337121 is a deficient number, since it is larger than the sum of its proper divisors (281372528).

1721337121 is an frugal number, since it uses more digits than its factorization.

1721337121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11868 (or 5934 counting only the distinct ones).

The product of its digits is 1764, while the sum is 28.

The cubic root of 1721337121 is about 1198.4556803146.

Multiplying 1721337121 by its product of digits (1764), we get a square (3036438681444 = 1742538²).

Adding to 1721337121 its reverse (1217331271), we get a palindrome (2938668392).

The spelling of 1721337121 in words is "one billion, seven hundred twenty-one million, three hundred thirty-seven thousand, one hundred twenty-one".