1621144441204 has 24 divisors (see below), whose sum is σ = 2857690993248. Its totient is φ = 804670769760.

The previous prime is 1621144441177. The next prime is 1621144441207. The reversal of 1621144441204 is 4021444411261.

It is a self number, because there is not a number n which added to its sum of digits gives 1621144441204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621144441207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497914 + ... + 1868209.

It is an arithmetic number, because the mean of its divisors is an integer number (119070458052).

Almost surely, 2^{1621144441204} is an apocalyptic number.

It is an amenable number.

1621144441204 is a deficient number, since it is larger than the sum of its proper divisors (1236546552044).

1621144441204 is a wasteful number, since it uses less digits than its factorization.

1621144441204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367375 (or 2367373 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

Adding to 1621144441204 its reverse (4021444411261), we get a palindrome (5642588852465).

The spelling of 1621144441204 in words is "one trillion, six hundred twenty-one billion, one hundred forty-four million, four hundred forty-one thousand, two hundred four".