21200111210122 has 16 divisors (see below), whose sum is σ = 34257306496392. Its totient is φ = 9781531568640.

The previous prime is 21200111210107. The next prime is 21200111210129. The reversal of 21200111210122 is 22101211100212.

It can be written as a sum of positive squares in 4 ways, for example, as 1858665962241 + 19341445247881 = 1363329^2 + 4397891^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21200111210096 and 21200111210105.

It is not an unprimeable number, because it can be changed into a prime (21200111210129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130548283 + ... + 130710574.

Almost surely, 2^{21200111210122} is an apocalyptic number.

21200111210122 is a deficient number, since it is larger than the sum of its proper divisors (13057195286270).

21200111210122 is a wasteful number, since it uses less digits than its factorization.

21200111210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261261993.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21200111210122 its reverse (22101211100212), we get a palindrome (43301322310334).

The spelling of 21200111210122 in words is "twenty-one trillion, two hundred billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-two".