21444443433 has 48 divisors (see below), whose sum is σ = 38097311616. Its totient is φ = 11344043520.

The previous prime is 21444443431. The next prime is 21444443483. The reversal of 21444443433 is 33434444412.

21444443433 is a `hidden beast` number, since 2 + 144 + 44 + 43 + 433 = 666.

It is not a de Polignac number, because 21444443433 - 2¹ = 21444443431 is a prime.

It is a super-2 number, since 2×21444443433² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21444443431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98791 + ... + 229452.

It is an arithmetic number, because the mean of its divisors is an integer number (793693992).

Almost surely, 2^21444443433 is an apocalyptic number.

It is an amenable number.

21444443433 is a deficient number, since it is larger than the sum of its proper divisors (16652868183).

21444443433 is a wasteful number, since it uses less digits than its factorization.

21444443433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328334 (or 328331 counting only the distinct ones).

The product of its digits is 221184, while the sum is 36.

Adding to 21444443433 its reverse (33434444412), we get a palindrome (54878887845).

The spelling of 21444443433 in words is "twenty-one billion, four hundred forty-four million, four hundred forty-three thousand, four hundred thirty-three".