21230440444444 has 48 divisors (see below), whose sum is σ = 46321316455680. Its totient is φ = 8271536693760.

The previous prime is 21230440444439. The next prime is 21230440444457. The reversal of 21230440444444 is 44444404403212.

It is a junction number, because it is equal to n+sod(n) for n = 21230440444397 and 21230440444406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71436147 + ... + 71732725.

It is an arithmetic number, because the mean of its divisors is an integer number (965027426160).

Almost surely, 2^{21230440444444} is an apocalyptic number.

It is an amenable number.

21230440444444 is an abundant number, since it is smaller than the sum of its proper divisors (25090876011236).

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

21230440444444 is a wasteful number, since it uses less digits than its factorization.

21230440444444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529018 (or 529016 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 40.

Adding to 21230440444444 its reverse (44444404403212), we get a palindrome (65674844847656).

The spelling of 21230440444444 in words is "twenty-one trillion, two hundred thirty billion, four hundred forty million, four hundred forty-four thousand, four hundred forty-four".