21102122111 has 8 divisors (see below), whose sum is σ = 24161293344. Its totient is φ = 18054096480.

The previous prime is 21102122099. The next prime is 21102122131. The reversal of 21102122111 is 11122120112.

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

It is not a de Polignac number, because 21102122111 - 2¹⁴ = 21102105727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102122131) 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, 2782340 + ... + 2789913.

It is an arithmetic number, because the mean of its divisors is an integer number (3020161668).

Almost surely, 2^21102122111 is an apocalyptic number.

21102122111 is a deficient number, since it is larger than the sum of its proper divisors (3059171233).

21102122111 is an equidigital number, since it uses as much as digits as its factorization.

21102122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5572801.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102122111 its reverse (11122120112), we get a palindrome (32224242223).

The spelling of 21102122111 in words is "twenty-one billion, one hundred two million, one hundred twenty-two thousand, one hundred eleven".