21122012222 has 8 divisors (see below), whose sum is σ = 31683968400. Its totient is φ = 10560689424.

The previous prime is 21122012183. The next prime is 21122012227. The reversal of 21122012222 is 22221022112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21122012222² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122012222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122012227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63647 + ... + 215162.

It is an arithmetic number, because the mean of its divisors is an integer number (3960496050).

Almost surely, 2^21122012222 is an apocalyptic number.

21122012222 is a deficient number, since it is larger than the sum of its proper divisors (10561956178).

21122012222 is a wasteful number, since it uses less digits than its factorization.

21122012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316690.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21122012222 its reverse (22221022112), we get a palindrome (43343034334).

The spelling of 21122012222 in words is "twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred twenty-two".