21111121102121 has 8 divisors (see below), whose sum is σ = 22276512743040. Its totient is φ = 19966355862112.

The previous prime is 21111121102067. The next prime is 21111121102157. The reversal of 21111121102121 is 12120112111112.

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 21111121102121 - 2¹⁴ = 21111121085737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111121102121.

It is not an unprimeable number, because it can be changed into a prime (21111121132121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5156598125 + ... + 5156602218.

It is an arithmetic number, because the mean of its divisors is an integer number (2784564092880).

Almost surely, 2^{21111121102121} is an apocalyptic number.

It is an amenable number.

21111121102121 is a deficient number, since it is larger than the sum of its proper divisors (1165391640919).

21111121102121 is a wasteful number, since it uses less digits than its factorization.

21111121102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10313200455.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 21111121102121 its reverse (12120112111112), we get a palindrome (33231233213233).

The spelling of 21111121102121 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty-one".