21110101121 has 8 divisors (see below), whose sum is σ = 21136625664. Its totient is φ = 21083595840.

The previous prime is 21110101099. The next prime is 21110101123. The reversal of 21110101121 is 12110101112.

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 21110101121 - 2²² = 21105906817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110101123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3820841 + ... + 3826361.

It is an arithmetic number, because the mean of its divisors is an integer number (2642078208).

Almost surely, 2^21110101121 is an apocalyptic number.

It is an amenable number.

21110101121 is a deficient number, since it is larger than the sum of its proper divisors (26524543).

21110101121 is a wasteful number, since it uses less digits than its factorization.

21110101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9631.

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

Adding to 21110101121 its reverse (12110101112), we get a palindrome (33220202233).

Subtracting from 21110101121 its reverse (12110101112), we obtain a palindrome (9000000009).

The spelling of 21110101121 in words is "twenty-one billion, one hundred ten million, one hundred one thousand, one hundred twenty-one".