21112210122111 has 24 divisors (see below), whose sum is σ = 30798559016784. Its totient is φ = 13935048998400.

The previous prime is 21112210122043. The next prime is 21112210122119. The reversal of 21112210122111 is 11122101221112.

It is a happy number.

21112210122111 is a `hidden beast` number, since 211 + 1 + 221 + 0 + 1 + 221 + 11 = 666.

It is not a de Polignac number, because 21112210122111 - 2¹⁸ = 21112209859967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112210122119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4825240 + ... + 8093661.

It is an arithmetic number, because the mean of its divisors is an integer number (1283273292366).

Almost surely, 2^{21112210122111} is an apocalyptic number.

21112210122111 is a deficient number, since it is larger than the sum of its proper divisors (9686348894673).

21112210122111 is a wasteful number, since it uses less digits than its factorization.

21112210122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12920711 (or 12920708 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21112210122111 its reverse (11122101221112), we get a palindrome (32234311343223).

It can be divided in two parts, 2 and 1112210122111, that multiplied together give a palindrome (2224420244222).

The spelling of 21112210122111 in words is "twenty-one trillion, one hundred twelve billion, two hundred ten million, one hundred twenty-two thousand, one hundred eleven".