21000224442 has 32 divisors (see below), whose sum is σ = 43376083200. Its totient is φ = 6774149888.

The previous prime is 21000224419. The next prime is 21000224461. The reversal of 21000224442 is 24442200012.

It is a super-2 number, since 2×21000224442² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393267 + ... + 443462.

It is an arithmetic number, because the mean of its divisors is an integer number (1355502600).

Almost surely, 2^21000224442 is an apocalyptic number.

21000224442 is an abundant number, since it is smaller than the sum of its proper divisors (22375858758).

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

21000224442 is a wasteful number, since it uses less digits than its factorization.

21000224442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836870.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 21000224442 its reverse (24442200012), we get a palindrome (45442424454).

The spelling of 21000224442 in words is "twenty-one billion, two hundred twenty-four thousand, four hundred forty-two".