21000110021121 has 32 divisors (see below), whose sum is σ = 34918779506688. Its totient is φ = 10906177530240.

The previous prime is 21000110021071. The next prime is 21000110021129. The reversal of 21000110021121 is 12112001100012.

It is not a de Polignac number, because 21000110021121 - 2¹⁴ = 21000110004737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000110021097 and 21000110021106.

It is not an unprimeable number, because it can be changed into a prime (21000110021129) 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 31 ways as a sum of consecutive naturals, for example, 11526921 + ... + 13223846.

It is an arithmetic number, because the mean of its divisors is an integer number (1091211859584).

Almost surely, 2^{21000110021121} is an apocalyptic number.

21000110021121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21000110021121 is a deficient number, since it is larger than the sum of its proper divisors (13918669485567).

21000110021121 is a wasteful number, since it uses less digits than its factorization.

21000110021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24754461.

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

Adding to 21000110021121 its reverse (12112001100012), we get a palindrome (33112111121133).

The spelling of 21000110021121 in words is "twenty-one trillion, one hundred ten million, twenty-one thousand, one hundred twenty-one".