20121021222111 has 48 divisors (see below), whose sum is σ = 30997655829504. Its totient is φ = 12547641154752.

The previous prime is 20121021222089. The next prime is 20121021222119. The reversal of 20121021222111 is 11122212012102.

20121021222111 is a `hidden beast` number, since 20 + 1 + 210 + 212 + 221 + 1 + 1 = 666.

It is not a de Polignac number, because 20121021222111 - 2¹⁵ = 20121021189343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121021222119) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11198820 + ... + 12870726.

It is an arithmetic number, because the mean of its divisors is an integer number (645784496448).

Almost surely, 2^{20121021222111} is an apocalyptic number.

20121021222111 is a deficient number, since it is larger than the sum of its proper divisors (10876634607393).

20121021222111 is a wasteful number, since it uses less digits than its factorization.

20121021222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673220 (or 1673217 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20121021222111 its reverse (11122212012102), we get a palindrome (31243233234213).

The spelling of 20121021222111 in words is "twenty trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred eleven".