20421144404 has 12 divisors (see below), whose sum is σ = 35771012928. Its totient is φ = 10200855000.

The previous prime is 20421144371. The next prime is 20421144479. The reversal of 20421144404 is 40444112402.

It is a congruent number.

It is an unprimeable number.

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, 2424572 + ... + 2432979.

It is an arithmetic number, because the mean of its divisors is an integer number (2980917744).

Almost surely, 2^20421144404 is an apocalyptic number.

It is an amenable number.

20421144404 is a deficient number, since it is larger than the sum of its proper divisors (15349868524).

20421144404 is a wasteful number, since it uses less digits than its factorization.

20421144404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4858606 (or 4858604 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 20421144404 its reverse (40444112402), we get a palindrome (60865256806).

The spelling of 20421144404 in words is "twenty billion, four hundred twenty-one million, one hundred forty-four thousand, four hundred four".