21110011112121 has 16 divisors (see below), whose sum is σ = 29054762139648. Its totient is φ = 13619304262800.

The previous prime is 21110011112117. The next prime is 21110011112159. The reversal of 21110011112121 is 12121111001112.

It is not a de Polignac number, because 21110011112121 - 2² = 21110011112117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21110011112121.

It is not an unprimeable number, because it can be changed into a prime (21110011110121) 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, 38189176 + ... + 38738006.

It is an arithmetic number, because the mean of its divisors is an integer number (1815922633728).

Almost surely, 2^{21110011112121} is an apocalyptic number.

It is an amenable number.

21110011112121 is a deficient number, since it is larger than the sum of its proper divisors (7944751027527).

21110011112121 is a wasteful number, since it uses less digits than its factorization.

21110011112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962452.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21110011112121 its reverse (12121111001112), we get a palindrome (33231122113233).

The spelling of 21110011112121 in words is "twenty-one trillion, one hundred ten billion, eleven million, one hundred twelve thousand, one hundred twenty-one".