20421340442044 has 12 divisors (see below), whose sum is σ = 35741118387744. Its totient is φ = 10209592331264.

The previous prime is 20421340442011. The next prime is 20421340442051. The reversal of 20421340442044 is 44024404312402.

It is a super-2 number, since 2×20421340442044² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269429812 + ... + 269505595.

It is an arithmetic number, because the mean of its divisors is an integer number (2978426532312).

Almost surely, 2^{20421340442044} is an apocalyptic number.

It is an amenable number.

20421340442044 is a deficient number, since it is larger than the sum of its proper divisors (15319777945700).

20421340442044 is a wasteful number, since it uses less digits than its factorization.

20421340442044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538944884 (or 538944882 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 34.

Adding to 20421340442044 its reverse (44024404312402), we get a palindrome (64445744754446).

The spelling of 20421340442044 in words is "twenty trillion, four hundred twenty-one billion, three hundred forty million, four hundred forty-two thousand, forty-four".