21442444434 has 48 divisors (see below), whose sum is σ = 47469397248. Its totient is φ = 6992122176.

The previous prime is 21442444421. The next prime is 21442444447. The reversal of 21442444434 is 43444424412.

It is a happy number.

21442444434 is a `hidden beast` number, since 214 + 4 + 2 + 4 + 4 + 4 + 434 = 666.

It is an interprime number because it is at equal distance from previous prime (21442444421) and next prime (21442444447).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2344779 + ... + 2353905.

It is an arithmetic number, because the mean of its divisors is an integer number (988945776).

Almost surely, 2^21442444434 is an apocalyptic number.

21442444434 is an abundant number, since it is smaller than the sum of its proper divisors (26026952814).

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

21442444434 is a wasteful number, since it uses less digits than its factorization.

21442444434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11959 (or 11956 counting only the distinct ones).

The product of its digits is 196608, while the sum is 36.

Adding to 21442444434 its reverse (43444424412), we get a palindrome (64886868846).

The spelling of 21442444434 in words is "twenty-one billion, four hundred forty-two million, four hundred forty-four thousand, four hundred thirty-four".