553721121 has 12 divisors (see below), whose sum is σ = 800422272. Its totient is φ = 368869176.

The previous prime is 553721117. The next prime is 553721141. The reversal of 553721121 is 121127355.

553721121 is a `hidden beast` number, since 5 + 537 + 2 + 1 + 121 = 666.

It is not a de Polignac number, because 553721121 - 2² = 553721117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (553721141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10201 + ... + 34806.

It is an arithmetic number, because the mean of its divisors is an integer number (66701856).

Almost surely, 2^553721121 is an apocalyptic number.

It is an amenable number.

553721121 is a deficient number, since it is larger than the sum of its proper divisors (246701151).

553721121 is a wasteful number, since it uses less digits than its factorization.

553721121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46380 (or 46377 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 553721121 is about 23531.2796294634. The cubic root of 553721121 is about 821.1648727816.

Adding to 553721121 its reverse (121127355), we get a palindrome (674848476).

The spelling of 553721121 in words is "five hundred fifty-three million, seven hundred twenty-one thousand, one hundred twenty-one".