20011201122221 has 8 divisors (see below), whose sum is σ = 20527002080640. Its totient is φ = 19499151443968.

The previous prime is 20011201122173. The next prime is 20011201122229. The reversal of 20011201122221 is 12222110211002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011201122221 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20011201122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011201122229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 937809236 + ... + 937830573.

It is an arithmetic number, because the mean of its divisors is an integer number (2565875260080).

Almost surely, 2^{20011201122221} is an apocalyptic number.

It is an amenable number.

20011201122221 is a deficient number, since it is larger than the sum of its proper divisors (515800958419).

20011201122221 is a wasteful number, since it uses less digits than its factorization.

20011201122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875640083.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20011201122221 its reverse (12222110211002), we get a palindrome (32233311333223).

The spelling of 20011201122221 in words is "twenty trillion, eleven billion, two hundred one million, one hundred twenty-two thousand, two hundred twenty-one".