21220244012 has 96 divisors (see below), whose sum is σ = 43309728000. Its totient is φ = 8996106240.

The previous prime is 21220243997. The next prime is 21220244029. The reversal of 21220244012 is 21044202212.

It is a super-2 number, since 2×21220244012² (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 (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22841564 + ... + 22842492.

It is an arithmetic number, because the mean of its divisors is an integer number (451143000).

Almost surely, 2^21220244012 is an apocalyptic number.

21220244012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220244012 is an abundant number, since it is smaller than the sum of its proper divisors (22089483988).

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

21220244012 is a wasteful number, since it uses less digits than its factorization.

21220244012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359 (or 1357 counting only the distinct ones).

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

Adding to 21220244012 its reverse (21044202212), we get a palindrome (42264446224).

The spelling of 21220244012 in words is "twenty-one billion, two hundred twenty million, two hundred forty-four thousand, twelve".