21211222200111 has 12 divisors (see below), whose sum is σ = 30654152170200. Its totient is φ = 14133559367760.

The previous prime is 21211222200101. The next prime is 21211222200137. The reversal of 21211222200111 is 11100222211212.

21211222200111 is a `hidden beast` number, since 21 + 211 + 222 + 200 + 1 + 11 = 666.

It is not a de Polignac number, because 21211222200111 - 2¹¹ = 21211222198063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222200101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 604600845 + ... + 604635926.

It is an arithmetic number, because the mean of its divisors is an integer number (2554512680850).

Almost surely, 2^{21211222200111} is an apocalyptic number.

21211222200111 is a deficient number, since it is larger than the sum of its proper divisors (9442929970089).

21211222200111 is a wasteful number, since it uses less digits than its factorization.

21211222200111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209238726 (or 1209238723 counting only the distinct ones).

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

Adding to 21211222200111 its reverse (11100222211212), we get a palindrome (32311444411323).

The spelling of 21211222200111 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred thousand, one hundred eleven".