21011101100121 has 32 divisors (see below), whose sum is σ = 30933128540160. Its totient is φ = 12579230664000.

The previous prime is 21011101100117. The next prime is 21011101100177. The reversal of 21011101100121 is 12100110111012.

It is not a de Polignac number, because 21011101100121 - 2² = 21011101100117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011101100097 and 21011101100106.

It is not an unprimeable number, because it can be changed into a prime (21011101100921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25447071 + ... + 26259771.

It is an arithmetic number, because the mean of its divisors is an integer number (966660266880).

Almost surely, 2^{21011101100121} is an apocalyptic number.

It is an amenable number.

21011101100121 is a deficient number, since it is larger than the sum of its proper divisors (9922027440039).

21011101100121 is a wasteful number, since it uses less digits than its factorization.

21011101100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822237.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21011101100121 its reverse (12100110111012), we get a palindrome (33111211211133).

The spelling of 21011101100121 in words is "twenty-one trillion, eleven billion, one hundred one million, one hundred thousand, one hundred twenty-one".