21001222202122 has 8 divisors (see below), whose sum is σ = 31557786827616. Its totient is φ = 10481959926252.

The previous prime is 21001222202111. The next prime is 21001222202123. The reversal of 21001222202122 is 22120222210012.

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 21001222202122.

It is not an unprimeable number, because it can be changed into a prime (21001222202123) 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, 9325585998 + ... + 9325588249.

It is an arithmetic number, because the mean of its divisors is an integer number (3944723353452).

Almost surely, 2^{21001222202122} is an apocalyptic number.

21001222202122 is a deficient number, since it is larger than the sum of its proper divisors (10556564625494).

21001222202122 is a wasteful number, since it uses less digits than its factorization.

21001222202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18651174812.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21001222202122 its reverse (22120222210012), we get a palindrome (43121444412134).

The spelling of 21001222202122 in words is "twenty-one trillion, one billion, two hundred twenty-two million, two hundred two thousand, one hundred twenty-two".