21012222224 has 40 divisors (see below), whose sum is σ = 49263954048. Its totient is φ = 8475517440.

The previous prime is 21012222221. The next prime is 21012222239. The reversal of 21012222224 is 42222221012.

It is a junction number, because it is equal to n+sod(n) for n = 21012222196 and 21012222205.

It is not an unprimeable number, because it can be changed into a prime (21012222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5516012 + ... + 5519819.

Almost surely, 2^21012222224 is an apocalyptic number.

It is an amenable number.

21012222224 is an abundant number, since it is smaller than the sum of its proper divisors (28251731824).

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

21012222224 is a wasteful number, since it uses less digits than its factorization.

21012222224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11035863 (or 11035857 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21012222224 its reverse (42222221012), we get a palindrome (63234443236).

The spelling of 21012222224 in words is "twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty-four".