1066323501221 has 8 divisors (see below), whose sum is σ = 1163269833600. Its totient is φ = 969378474240.

The previous prime is 1066323501209. The next prime is 1066323501233. The reversal of 1066323501221 is 1221053236601.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1066323501209) and next prime (1066323501233).

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

It is not a de Polignac number, because 1066323501221 - 2³⁰ = 1065249759397 is a prime.

It is a super-2 number, since 2×1066323501221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066323501421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2302085 + ... + 2726213.

It is an arithmetic number, because the mean of its divisors is an integer number (145408729200).

Almost surely, 2^{1066323501221} is an apocalyptic number.

1066323501221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1066323501221 is a deficient number, since it is larger than the sum of its proper divisors (96946332379).

1066323501221 is a wasteful number, since it uses less digits than its factorization.

1066323501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652699.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 1066323501221 its reverse (1221053236601), we get a palindrome (2287376737822).

The spelling of 1066323501221 in words is "one trillion, sixty-six billion, three hundred twenty-three million, five hundred one thousand, two hundred twenty-one".