20211222121111 has 6 divisors (see below), whose sum is σ = 23511013487880. Its totient is φ = 17323904675196.

The previous prime is 20211222121109. The next prime is 20211222121151. The reversal of 20211222121111 is 11112122211202.

It is a happy number.

It is not a de Polignac number, because 20211222121111 - 2¹ = 20211222121109 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 (20211222121151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 206236960371 + ... + 206236960468.

It is an arithmetic number, because the mean of its divisors is an integer number (3918502247980).

Almost surely, 2^{20211222121111} is an apocalyptic number.

20211222121111 is a deficient number, since it is larger than the sum of its proper divisors (3299791366769).

20211222121111 is an equidigital number, since it uses as much as digits as its factorization.

20211222121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412473920853 (or 412473920846 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 20211222121111 its reverse (11112122211202), we get a palindrome (31323344332313).

Subtracting from 20211222121111 its reverse (11112122211202), we obtain a palindrome (9099099909909).

The spelling of 20211222121111 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".