21102122222111 has 16 divisors (see below), whose sum is σ = 25769610377280. Its totient is φ = 16867381317120.

The previous prime is 21102122221997. The next prime is 21102122222119. The reversal of 21102122222111 is 11122222120112.

It is a cyclic number.

It is not a de Polignac number, because 21102122222111 - 2²⁶ = 21102055113247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102122222119) 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, 813421700 + ... + 813447641.

It is an arithmetic number, because the mean of its divisors is an integer number (1610600648580).

Almost surely, 2^{21102122222111} is an apocalyptic number.

21102122222111 is a deficient number, since it is larger than the sum of its proper divisors (4667488155169).

21102122222111 is a wasteful number, since it uses less digits than its factorization.

21102122222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626869474.

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

Adding to 21102122222111 its reverse (11122222120112), we get a palindrome (32224344342223).

The spelling of 21102122222111 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred eleven".