20001222210122 has 4 divisors (see below), whose sum is σ = 30001833315186. Its totient is φ = 10000611105060.

The previous prime is 20001222210007. The next prime is 20001222210163. The reversal of 20001222210122 is 22101222210002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18471867047881 + 1529355162241 = 4297891^2 + 1236671^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20001222210122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000305552529 + ... + 5000305552532.

Almost surely, 2^{20001222210122} is an apocalyptic number.

20001222210122 is a deficient number, since it is larger than the sum of its proper divisors (10000611105064).

20001222210122 is a wasteful number, since it uses less digits than its factorization.

20001222210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10000611105063.

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

Adding to 20001222210122 its reverse (22101222210002), we get a palindrome (42102444420124).

The spelling of 20001222210122 in words is "twenty trillion, one billion, two hundred twenty-two million, two hundred ten thousand, one hundred twenty-two".