21020244144021 has 12 divisors (see below), whose sum is σ = 31960605131520. Its totient is φ = 13275943669800.

The previous prime is 21020244144013. The next prime is 21020244144037. The reversal of 21020244144021 is 12044144202012.

21020244144021 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 0 + 244 + 14 + 402 + 1 = 666.

It is not a de Polignac number, because 21020244144021 - 2³ = 21020244144013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020244144041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61462702005 + ... + 61462702346.

It is an arithmetic number, because the mean of its divisors is an integer number (2663383760960).

Almost surely, 2^{21020244144021} is an apocalyptic number.

It is an amenable number.

21020244144021 is a deficient number, since it is larger than the sum of its proper divisors (10940360987499).

21020244144021 is a wasteful number, since it uses less digits than its factorization.

21020244144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122925404376 (or 122925404373 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 21020244144021 its reverse (12044144202012), we get a palindrome (33064388346033).

The spelling of 21020244144021 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-four thousand, twenty-one".