20201222121111 has 16 divisors (see below), whose sum is σ = 29927833689600. Its totient is φ = 13467437667864.

The previous prime is 20201222121089. The next prime is 20201222121151. The reversal of 20201222121111 is 11112122210202.

20201222121111 is a `hidden beast` number, since 20 + 201 + 2 + 221 + 211 + 11 = 666.

It is not a de Polignac number, because 20201222121111 - 2⁵ = 20201222121079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201222121151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8731000 + ... + 10799666.

It is an arithmetic number, because the mean of its divisors is an integer number (1870489605600).

Almost surely, 2^{20201222121111} is an apocalyptic number.

20201222121111 is a deficient number, since it is larger than the sum of its proper divisors (9726611568489).

20201222121111 is a wasteful number, since it uses less digits than its factorization.

20201222121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430355 (or 2430349 counting only the distinct ones).

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

Adding to 20201222121111 its reverse (11112122210202), we get a palindrome (31313344331313).

The spelling of 20201222121111 in words is "twenty trillion, two hundred one billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".