20144443421 has 8 divisors (see below), whose sum is σ = 20382507264. Its totient is φ = 19907699040.

The previous prime is 20144443409. The next prime is 20144443427. The reversal of 20144443421 is 12434444102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20144443421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144443427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299135 + ... + 360236.

It is an arithmetic number, because the mean of its divisors is an integer number (2547813408).

Almost surely, 2^20144443421 is an apocalyptic number.

It is an amenable number.

20144443421 is a deficient number, since it is larger than the sum of its proper divisors (238063843).

20144443421 is a wasteful number, since it uses less digits than its factorization.

20144443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659731.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 20144443421 its reverse (12434444102), we get a palindrome (32578887523).

The spelling of 20144443421 in words is "twenty billion, one hundred forty-four million, four hundred forty-three thousand, four hundred twenty-one".