21110100121 has 8 divisors (see below), whose sum is σ = 23031527904. Its totient is φ = 19189060320.

The previous prime is 21110100083. The next prime is 21110100133. The reversal of 21110100121 is 12100101112.

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 21110100121 - 2²³ = 21101711513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110100098 and 21110100107.

It is not an unprimeable number, because it can be changed into a prime (21110100161) 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, 23266 + ... + 206788.

It is an arithmetic number, because the mean of its divisors is an integer number (2878940988).

Almost surely, 2^21110100121 is an apocalyptic number.

It is an amenable number.

21110100121 is a deficient number, since it is larger than the sum of its proper divisors (1921427783).

21110100121 is a wasteful number, since it uses less digits than its factorization.

21110100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193991.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21110100121 its reverse (12100101112), we get a palindrome (33210201233).

Subtracting from 21110100121 its reverse (12100101112), we obtain a palindrome (9009999009).

The spelling of 21110100121 in words is "twenty-one billion, one hundred ten million, one hundred thousand, one hundred twenty-one".