21220222012 has 24 divisors (see below), whose sum is σ = 41175458352. Its totient is φ = 9487430400.

The previous prime is 21220221983. The next prime is 21220222033. The reversal of 21220222012 is 21022202212.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3950413 + ... + 3955780.

It is an arithmetic number, because the mean of its divisors is an integer number (1715644098).

Almost surely, 2^21220222012 is an apocalyptic number.

21220222012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220222012 is a deficient number, since it is larger than the sum of its proper divisors (19955236340).

21220222012 is a wasteful number, since it uses less digits than its factorization.

21220222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7906269 (or 7906267 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21220222012 its reverse (21022202212), we get a palindrome (42242424224).

The spelling of 21220222012 in words is "twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, twelve".