21202144044 has 24 divisors (see below), whose sum is σ = 49474999728. Its totient is φ = 7066905600.

The previous prime is 21202144039. The next prime is 21202144049. The reversal of 21202144044 is 44044120212.

It is an interprime number because it is at equal distance from previous prime (21202144039) and next prime (21202144049).

It is not an unprimeable number, because it can be changed into a prime (21202144049) 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, 158044 + ... + 259580.

It is an arithmetic number, because the mean of its divisors is an integer number (2061458322).

Almost surely, 2^21202144044 is an apocalyptic number.

It is an amenable number.

21202144044 is an abundant number, since it is smaller than the sum of its proper divisors (28272855684).

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

21202144044 is a wasteful number, since it uses less digits than its factorization.

21202144044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118945 (or 118943 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21202144044 its reverse (44044120212), we get a palindrome (65246264256).

The spelling of 21202144044 in words is "twenty-one billion, two hundred two million, one hundred forty-four thousand, forty-four".