20001122102221 has 16 divisors (see below), whose sum is σ = 22846415739840. Its totient is φ = 17357341772160.

The previous prime is 20001122102207. The next prime is 20001122102231. The reversal of 20001122102221 is 12220122110002.

It is a happy number.

It is not a de Polignac number, because 20001122102221 - 2²³ = 20001113713613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001122102195 and 20001122102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001122102201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309037120 + ... + 309101833.

It is an arithmetic number, because the mean of its divisors is an integer number (1427900983740).

Almost surely, 2^{20001122102221} is an apocalyptic number.

It is an amenable number.

20001122102221 is a deficient number, since it is larger than the sum of its proper divisors (2845293637619).

20001122102221 is a wasteful number, since it uses less digits than its factorization.

20001122102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618139116.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20001122102221 its reverse (12220122110002), we get a palindrome (32221244212223).

The spelling of 20001122102221 in words is "twenty trillion, one billion, one hundred twenty-two million, one hundred two thousand, two hundred twenty-one".