21222767612 has 48 divisors (see below), whose sum is σ = 38506876800. Its totient is φ = 10230105600.

The previous prime is 21222767563. The next prime is 21222767623. The reversal of 21222767612 is 21676722212.

It is a happy number.

It is a super-2 number, since 2×21222767612² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2325314 + ... + 2334422.

It is an arithmetic number, because the mean of its divisors is an integer number (802226600).

Almost surely, 2^21222767612 is an apocalyptic number.

It is an amenable number.

21222767612 is a deficient number, since it is larger than the sum of its proper divisors (17284109188).

21222767612 is a wasteful number, since it uses less digits than its factorization.

21222767612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9366 (or 9364 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The spelling of 21222767612 in words is "twenty-one billion, two hundred twenty-two million, seven hundred sixty-seven thousand, six hundred twelve".