21110121000021 has 16 divisors (see below), whose sum is σ = 29376593934336. Its totient is φ = 13458780649776.

The previous prime is 21110121000011. The next prime is 21110121000083. The reversal of 21110121000021 is 12000012101112.

It is not a de Polignac number, because 21110121000021 - 2¹⁰ = 21110120998997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110120999970 and 21110121000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110121000011) 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, 30861345 + ... + 31537958.

It is an arithmetic number, because the mean of its divisors is an integer number (1836037120896).

Almost surely, 2^{21110121000021} is an apocalyptic number.

It is an amenable number.

21110121000021 is a deficient number, since it is larger than the sum of its proper divisors (8266472934315).

21110121000021 is a wasteful number, since it uses less digits than its factorization.

21110121000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62404232.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110121000021 its reverse (12000012101112), we get a palindrome (33110133101133).

The spelling of 21110121000021 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one million, twenty-one", and thus it is an aban number.