21110120210121 has 16 divisors (see below), whose sum is σ = 28314383328000. Its totient is φ = 13989868325888.

The previous prime is 21110120210117. The next prime is 21110120210129. The reversal of 21110120210121 is 12101202101112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21110120210121 - 2² = 21110120210117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110120210121.

It is not an unprimeable number, because it can be changed into a prime (21110120210129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28767681 + ... + 29492366.

It is an arithmetic number, because the mean of its divisors is an integer number (1769648958000).

Almost surely, 2^{21110120210121} is an apocalyptic number.

It is an amenable number.

21110120210121 is a deficient number, since it is larger than the sum of its proper divisors (7204263117879).

21110120210121 is a wasteful number, since it uses less digits than its factorization.

21110120210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58260768.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21110120210121 its reverse (12101202101112), we get a palindrome (33211322311233).

The spelling of 21110120210121 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty million, two hundred ten thousand, one hundred twenty-one".