21214421444 has 12 divisors (see below), whose sum is σ = 37127235600. Its totient is φ = 10606639848.

The previous prime is 21214421441. The next prime is 21214421453. The reversal of 21214421444 is 44412441212.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21214421441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52814 + ... + 212645.

It is an arithmetic number, because the mean of its divisors is an integer number (3093936300).

Almost surely, 2^21214421444 is an apocalyptic number.

It is an amenable number.

21214421444 is a deficient number, since it is larger than the sum of its proper divisors (15912814156).

21214421444 is a wasteful number, since it uses less digits than its factorization.

21214421444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285442 (or 285440 counting only the distinct ones).

The product of its digits is 8192, while the sum is 29.

Adding to 21214421444 its reverse (44412441212), we get a palindrome (65626862656).

The spelling of 21214421444 in words is "twenty-one billion, two hundred fourteen million, four hundred twenty-one thousand, four hundred forty-four".