21002231414444 has 12 divisors (see below), whose sum is σ = 42004462828944. Its totient is φ = 9000956320464.

The previous prime is 21002231414441. The next prime is 21002231414453. The reversal of 21002231414444 is 44441413220012.

21002231414444 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002231414444.

It is not an unprimeable number, because it can be changed into a prime (21002231414441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375039846659 + ... + 375039846714.

It is an arithmetic number, because the mean of its divisors is an integer number (3500371902412).

Almost surely, 2^{21002231414444} is an apocalyptic number.

It is an amenable number.

21002231414444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21002231414444 is a wasteful number, since it uses less digits than its factorization.

21002231414444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750079693384 (or 750079693382 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 21002231414444 its reverse (44441413220012), we get a palindrome (65443644634456).

The spelling of 21002231414444 in words is "twenty-one trillion, two billion, two hundred thirty-one million, four hundred fourteen thousand, four hundred forty-four".