20121022201111 has 4 divisors (see below), whose sum is σ = 21668793139672. Its totient is φ = 18573251262552.

The previous prime is 20121022201099. The next prime is 20121022201141. The reversal of 20121022201111 is 11110222012102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121022201111 - 2¹¹ = 20121022199063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121022201141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773885469261 + ... + 773885469286.

It is an arithmetic number, because the mean of its divisors is an integer number (5417198284918).

Almost surely, 2^{20121022201111} is an apocalyptic number.

20121022201111 is a deficient number, since it is larger than the sum of its proper divisors (1547770938561).

20121022201111 is a wasteful number, since it uses less digits than its factorization.

20121022201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547770938560.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121022201111 its reverse (11110222012102), we get a palindrome (31231244213213).

The spelling of 20121022201111 in words is "twenty trillion, one hundred twenty-one billion, twenty-two million, two hundred one thousand, one hundred eleven".