21201344234444 has 48 divisors (see below), whose sum is σ = 40629198758400. Its totient is φ = 9600336628800.

The previous prime is 21201344234383. The next prime is 21201344234449. The reversal of 21201344234444 is 44443244310212.

It is a super-3 number, since 3×21201344234444³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201344234398 and 21201344234407.

It is not an unprimeable number, because it can be changed into a prime (21201344234449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152745227 + ... + 152883965.

It is an arithmetic number, because the mean of its divisors is an integer number (846441640800).

Almost surely, 2^{21201344234444} is an apocalyptic number.

It is an amenable number.

21201344234444 is a deficient number, since it is larger than the sum of its proper divisors (19427854523956).

21201344234444 is a wasteful number, since it uses less digits than its factorization.

21201344234444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151934 (or 151932 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 38.

Adding to 21201344234444 its reverse (44443244310212), we get a palindrome (65644588544656).

The spelling of 21201344234444 in words is "twenty-one trillion, two hundred one billion, three hundred forty-four million, two hundred thirty-four thousand, four hundred forty-four".