21101210111 has 8 divisors (see below), whose sum is σ = 21468013200. Its totient is φ = 20734712320.

The previous prime is 21101210093. The next prime is 21101210159. The reversal of 21101210111 is 11101210112.

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

It is a cyclic number.

It is not a de Polignac number, because 21101210111 - 2¹⁴ = 21101193727 is a prime.

It is a super-2 number, since 2×21101210111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101210092 and 21101210101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101218111) 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, 65375 + ... + 215583.

It is an arithmetic number, because the mean of its divisors is an integer number (2683501650).

Almost surely, 2^21101210111 is an apocalyptic number.

21101210111 is a deficient number, since it is larger than the sum of its proper divisors (366803089).

21101210111 is a wasteful number, since it uses less digits than its factorization.

21101210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152649.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21101210111 its reverse (11101210112), we get a palindrome (32202420223).

Subtracting from 21101210111 its reverse (11101210112), we obtain a palindrome (9999999999).

The spelling of 21101210111 in words is "twenty-one billion, one hundred one million, two hundred ten thousand, one hundred eleven".