21122222200111 has 16 divisors (see below), whose sum is σ = 23002581679200. Its totient is φ = 19318847683968.

The previous prime is 21122222200109. The next prime is 21122222200117. The reversal of 21122222200111 is 11100222222112.

It is a cyclic number.

It is not a de Polignac number, because 21122222200111 - 2¹ = 21122222200109 is a prime.

It is a super-2 number, since 2×21122222200111² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122222200117) 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, 4792581 + ... + 8075473.

It is an arithmetic number, because the mean of its divisors is an integer number (1437661354950).

Almost surely, 2^{21122222200111} is an apocalyptic number.

21122222200111 is a deficient number, since it is larger than the sum of its proper divisors (1880359479089).

21122222200111 is a wasteful number, since it uses less digits than its factorization.

21122222200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294618.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21122222200111 its reverse (11100222222112), we get a palindrome (32222444422223).

The spelling of 21122222200111 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-two million, two hundred thousand, one hundred eleven".