21444544043212 has 12 divisors (see below), whose sum is σ = 37533130538400. Its totient is φ = 10720792460816.

The previous prime is 21444544043207. The next prime is 21444544043261. The reversal of 21444544043212 is 21234044544412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369857587 + ... + 369915562.

It is an arithmetic number, because the mean of its divisors is an integer number (3127760878200).

Almost surely, 2^{21444544043212} is an apocalyptic number.

It is an amenable number.

21444544043212 is a deficient number, since it is larger than the sum of its proper divisors (16088586495188).

21444544043212 is a wasteful number, since it uses less digits than its factorization.

21444544043212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739780400 (or 739780398 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 40.

Adding to 21444544043212 its reverse (21234044544412), we get a palindrome (42678588587624).

The spelling of 21444544043212 in words is "twenty-one trillion, four hundred forty-four billion, five hundred forty-four million, forty-three thousand, two hundred twelve".