1321621432 has 16 divisors (see below), whose sum is σ = 2478429000. Its totient is φ = 660707040.

The previous prime is 1321621397. The next prime is 1321621439. The reversal of 1321621432 is 2341261231.

It is a junction number, because it is equal to n+sod(n) for n = 1321621397 and 1321621406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321621439) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 83082 + ... + 97702.

Almost surely, 2^1321621432 is an apocalyptic number.

It is an amenable number.

1321621432 is a deficient number, since it is larger than the sum of its proper divisors (1156807568).

1321621432 is a wasteful number, since it uses less digits than its factorization.

1321621432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25926 (or 25922 counting only the distinct ones).

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

The square root of 1321621432 is about 36354.1116244091. Note that the first 3 decimals coincide. The cubic root of 1321621432 is about 1097.4102802835.

Adding to 1321621432 its reverse (2341261231), we get a palindrome (3662882663).

The spelling of 1321621432 in words is "one billion, three hundred twenty-one million, six hundred twenty-one thousand, four hundred thirty-two".