21211232122 has 16 divisors (see below), whose sum is σ = 33691976640. Its totient is φ = 9987258528.

The previous prime is 21211232087. The next prime is 21211232143. The reversal of 21211232122 is 22123211212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21211232122.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1664883 + ... + 1677574.

It is an arithmetic number, because the mean of its divisors is an integer number (2105748540).

Almost surely, 2^21211232122 is an apocalyptic number.

21211232122 is a deficient number, since it is larger than the sum of its proper divisors (12480744518).

21211232122 is a wasteful number, since it uses less digits than its factorization.

21211232122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342645.

The product of its digits is 192, while the sum is 19.

Adding to 21211232122 its reverse (22123211212), we get a palindrome (43334443334).

The spelling of 21211232122 in words is "twenty-one billion, two hundred eleven million, two hundred thirty-two thousand, one hundred twenty-two".