21110102010121 has 4 divisors (see below), whose sum is σ = 21190368557952. Its totient is φ = 21029835462292.

The previous prime is 21110102010097. The next prime is 21110102010149. The reversal of 21110102010121 is 12101020101112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21110102010121 - 2¹⁹ = 21110101485833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110102010161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40133273521 + ... + 40133274046.

It is an arithmetic number, because the mean of its divisors is an integer number (5297592139488).

Almost surely, 2^{21110102010121} is an apocalyptic number.

It is an amenable number.

21110102010121 is a deficient number, since it is larger than the sum of its proper divisors (80266547831).

21110102010121 is an equidigital number, since it uses as much as digits as its factorization.

21110102010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80266547830.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21110102010121 its reverse (12101020101112), we get a palindrome (33211122111233).

The spelling of 21110102010121 in words is "twenty-one trillion, one hundred ten billion, one hundred two million, ten thousand, one hundred twenty-one".