1321066550 has 24 divisors (see below), whose sum is σ = 2536450752. Its totient is φ = 511380000.

The previous prime is 1321066543. The next prime is 1321066603. The reversal of 1321066550 is 556601231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 424601 + ... + 427700.

It is an arithmetic number, because the mean of its divisors is an integer number (105685448).

Almost surely, 2^1321066550 is an apocalyptic number.

1321066550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321066550 is a deficient number, since it is larger than the sum of its proper divisors (1215384202).

1321066550 is a wasteful number, since it uses less digits than its factorization.

1321066550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852344 (or 852339 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1321066550 is about 36346.4791967530. The cubic root of 1321066550 is about 1097.2566764258.

Adding to 1321066550 its reverse (556601231), we get a palindrome (1877667781).

The spelling of 1321066550 in words is "one billion, three hundred twenty-one million, sixty-six thousand, five hundred fifty".