1321240066 has 16 divisors (see below), whose sum is σ = 2022887520. Its totient is φ = 647083360.

The previous prime is 1321240049. The next prime is 1321240091. The reversal of 1321240066 is 6600421231.

It is a super-3 number, since 3×1321240066³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321240066.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15640 + ... + 53731.

It is an arithmetic number, because the mean of its divisors is an integer number (126430470).

Almost surely, 2^1321240066 is an apocalyptic number.

1321240066 is a deficient number, since it is larger than the sum of its proper divisors (701647454).

1321240066 is a wasteful number, since it uses less digits than its factorization.

1321240066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69569.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1321240066 is about 36348.8660896045. The cubic root of 1321240066 is about 1097.3047141911.

Adding to 1321240066 its reverse (6600421231), we get a palindrome (7921661297).

The spelling of 1321240066 in words is "one billion, three hundred twenty-one million, two hundred forty thousand, sixty-six".