20001220202122 has 4 divisors (see below), whose sum is σ = 30001830303186. Its totient is φ = 10000610101060.

The previous prime is 20001220202087. The next prime is 20001220202143. The reversal of 20001220202122 is 22120202210002.

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., 15624793858041 + 4376426344081 = 3952821^2 + 2091991^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20001220202096 and 20001220202105.

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 as a sum of consecutive naturals, namely, 5000305050529 + ... + 5000305050532.

Almost surely, 2^{20001220202122} is an apocalyptic number.

20001220202122 is a deficient number, since it is larger than the sum of its proper divisors (10000610101064).

20001220202122 is a wasteful number, since it uses less digits than its factorization.

20001220202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000610101063.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20001220202122 its reverse (22120202210002), we get a palindrome (42121422412124).

The spelling of 20001220202122 in words is "twenty trillion, one billion, two hundred twenty million, two hundred two thousand, one hundred twenty-two".