1621105232 has 80 divisors (see below), whose sum is σ = 3419781120. Its totient is φ = 741888000.

The previous prime is 1621105229. The next prime is 1621105271. The reversal of 1621105232 is 2325011261.

It is a junction number, because it is equal to n+sod(n) for n = 1621105198 and 1621105207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1407857 + ... + 1409007.

It is an arithmetic number, because the mean of its divisors is an integer number (42747264).

Almost surely, 2^1621105232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621105232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709890560).

1621105232 is an abundant number, since it is smaller than the sum of its proper divisors (1798675888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621105232 is a wasteful number, since it uses less digits than its factorization.

1621105232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332 (or 1326 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1621105232 is about 40262.9511089289. The cubic root of 1621105232 is about 1174.7273203372.

Adding to 1621105232 its reverse (2325011261), we get a palindrome (3946116493).

The spelling of 1621105232 in words is "one billion, six hundred twenty-one million, one hundred five thousand, two hundred thirty-two".