66321121 has 16 divisors (see below), whose sum is σ = 71958528. Its totient is φ = 60944400.

The previous prime is 66321119. The next prime is 66321127. The reversal of 66321121 is 12112366.

It is a cyclic number.

It is not a de Polignac number, because 66321121 - 2¹ = 66321119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66321092 and 66321101.

It is not an unprimeable number, because it can be changed into a prime (66321127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135940 + ... + 136426.

It is an arithmetic number, because the mean of its divisors is an integer number (4497408).

Almost surely, 2^66321121 is an apocalyptic number.

It is an amenable number.

66321121 is a deficient number, since it is larger than the sum of its proper divisors (5637407).

66321121 is a wasteful number, since it uses less digits than its factorization.

66321121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732.

The product of its digits is 432, while the sum is 22.

The square root of 66321121 is about 8143.7780544413. The cubic root of 66321121 is about 404.7783596498.

Adding to 66321121 its reverse (12112366), we get a palindrome (78433487).

The spelling of 66321121 in words is "sixty-six million, three hundred twenty-one thousand, one hundred twenty-one".