21222121200111 has 16 divisors (see below), whose sum is σ = 33858654906720. Its totient is φ = 13059766892160.

The previous prime is 21222121200101. The next prime is 21222121200113. The reversal of 21222121200111 is 11100212122212.

21222121200111 is a `hidden beast` number, since 212 + 22 + 121 + 200 + 111 = 666.

It is not a de Polignac number, because 21222121200111 - 2²³ = 21222112811503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222121200113) 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, 30230941530 + ... + 30230942231.

It is an arithmetic number, because the mean of its divisors is an integer number (2116165931670).

Almost surely, 2^{21222121200111} is an apocalyptic number.

21222121200111 is a deficient number, since it is larger than the sum of its proper divisors (12636533706609).

21222121200111 is a wasteful number, since it uses less digits than its factorization.

21222121200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60461883783 (or 60461883777 counting only the distinct ones).

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

Adding to 21222121200111 its reverse (11100212122212), we get a palindrome (32322333322323).

The spelling of 21222121200111 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred thousand, one hundred eleven".