20111022012221 has 8 divisors (see below), whose sum is σ = 22984053518400. Its totient is φ = 17237997596448.

The previous prime is 20111022012199. The next prime is 20111022012239. The reversal of 20111022012221 is 12221022011102.

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-20111022012221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111022012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111022012121) 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, 7631270 + ... + 9922616.

It is an arithmetic number, because the mean of its divisors is an integer number (2873006689800).

Almost surely, 2^{20111022012221} is an apocalyptic number.

It is an amenable number.

20111022012221 is a deficient number, since it is larger than the sum of its proper divisors (2873031506179).

20111022012221 is a wasteful number, since it uses less digits than its factorization.

20111022012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545203.

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

Adding to 20111022012221 its reverse (12221022011102), we get a palindrome (32332044023323).

The spelling of 20111022012221 in words is "twenty trillion, one hundred eleven billion, twenty-two million, twelve thousand, two hundred twenty-one".