21110222012 has 24 divisors (see below), whose sum is σ = 40657991472. Its totient is φ = 9510636800.

The previous prime is 21110221991. The next prime is 21110222027. The reversal of 21110222012 is 21022201112.

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, 2117939 + ... + 2127882.

It is an arithmetic number, because the mean of its divisors is an integer number (1694082978).

Almost surely, 2^21110222012 is an apocalyptic number.

21110222012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21110222012 is a deficient number, since it is larger than the sum of its proper divisors (19547769460).

21110222012 is a wasteful number, since it uses less digits than its factorization.

21110222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245949 (or 4245947 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21110222012 its reverse (21022201112), we get a palindrome (42132423124).

The spelling of 21110222012 in words is "twenty-one billion, one hundred ten million, two hundred twenty-two thousand, twelve".