1321205752 has 8 divisors (see below), whose sum is σ = 2477260800. Its totient is φ = 660602872.

The previous prime is 1321205747. The next prime is 1321205759. The reversal of 1321205752 is 2575021231.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1321205752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321205759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82575352 + ... + 82575367.

It is an arithmetic number, because the mean of its divisors is an integer number (309657600).

Almost surely, 2^1321205752 is an apocalyptic number.

It is an amenable number.

1321205752 is a deficient number, since it is larger than the sum of its proper divisors (1156055048).

1321205752 is a wasteful number, since it uses less digits than its factorization.

1321205752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165150725 (or 165150721 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1321205752 is about 36348.3940773179. The cubic root of 1321205752 is about 1097.2952147214.

Adding to 1321205752 its reverse (2575021231), we get a palindrome (3896226983).

The spelling of 1321205752 in words is "one billion, three hundred twenty-one million, two hundred five thousand, seven hundred fifty-two".