21221202122 has 16 divisors (see below), whose sum is σ = 32343730272. Its totient is φ = 10440978000.

The previous prime is 21221202109. The next prime is 21221202131. The reversal of 21221202122 is 22120212212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221202122.

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, 212993 + ... + 296324.

It is an arithmetic number, because the mean of its divisors is an integer number (2021483142).

Almost surely, 2^21221202122 is an apocalyptic number.

21221202122 is a deficient number, since it is larger than the sum of its proper divisors (11122528150).

21221202122 is a wasteful number, since it uses less digits than its factorization.

21221202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509653.

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

Adding to 21221202122 its reverse (22120212212), we get a palindrome (43341414334).

The spelling of 21221202122 in words is "twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty-two".