21122012222111 has 8 divisors (see below), whose sum is σ = 22364828752464. Its totient is φ = 19879234049920.

The previous prime is 21122012222099. The next prime is 21122012222173. The reversal of 21122012222111 is 11122221022112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122012222111 is a prime.

It is a super-2 number, since 2×21122012222111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122012228111) 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, 8451980 + ... + 10662081.

It is an arithmetic number, because the mean of its divisors is an integer number (2795603594058).

Almost surely, 2^{21122012222111} is an apocalyptic number.

21122012222111 is a deficient number, since it is larger than the sum of its proper divisors (1242816530353).

21122012222111 is a wasteful number, since it uses less digits than its factorization.

21122012222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19179081.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21122012222111 its reverse (11122221022112), we get a palindrome (32244233244223).

The spelling of 21122012222111 in words is "twenty-one trillion, one hundred twenty-two billion, twelve million, two hundred twenty-two thousand, one hundred eleven".