21202122122 has 8 divisors (see below), whose sum is σ = 31903509636. Its totient is φ = 10567618912.

The previous prime is 21202122121. The next prime is 21202122143. The reversal of 21202122122 is 22122120212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21065909881 + 136212241 = 145141^2 + 11671^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21202122122.

It is not an unprimeable number, because it can be changed into a prime (21202122121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16720283 + ... + 16721550.

Almost surely, 2^21202122122 is an apocalyptic number.

21202122122 is a deficient number, since it is larger than the sum of its proper divisors (10701387514).

21202122122 is a wasteful number, since it uses less digits than its factorization.

21202122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33442152.

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

Adding to 21202122122 its reverse (22122120212), we get a palindrome (43324242334).

The spelling of 21202122122 in words is "twenty-one billion, two hundred two million, one hundred twenty-two thousand, one hundred twenty-two".