21003222012 has 12 divisors (see below), whose sum is σ = 49007518056. Its totient is φ = 7001074000.

The previous prime is 21003222007. The next prime is 21003222029. The reversal of 21003222012 is 21022230012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21003222012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003221982 and 21003222000.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 875134239 + ... + 875134262.

It is an arithmetic number, because the mean of its divisors is an integer number (4083959838).

Almost surely, 2^21003222012 is an apocalyptic number.

It is an amenable number.

21003222012 is an abundant number, since it is smaller than the sum of its proper divisors (28004296044).

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

21003222012 is a wasteful number, since it uses less digits than its factorization.

21003222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750268508 (or 1750268506 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21003222012 its reverse (21022230012), we get a palindrome (42025452024).

The spelling of 21003222012 in words is "twenty-one billion, three million, two hundred twenty-two thousand, twelve".