21042231100121 has 16 divisors (see below), whose sum is σ = 27080743170048. Its totient is φ = 15867622947600.

The previous prime is 21042231100097. The next prime is 21042231100157. The reversal of 21042231100121 is 12100113224012.

It is a cyclic number.

It is not a de Polignac number, because 21042231100121 - 2⁶ = 21042231100057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21042231100093 and 21042231100102.

It is not an unprimeable number, because it can be changed into a prime (21042231100921) 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, 4407670655 + ... + 4407675428.

It is an arithmetic number, because the mean of its divisors is an integer number (1692546448128).

Almost surely, 2^{21042231100121} is an apocalyptic number.

It is an amenable number.

21042231100121 is a deficient number, since it is larger than the sum of its proper divisors (6038512069927).

21042231100121 is a wasteful number, since it uses less digits than its factorization.

21042231100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8815346132.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21042231100121 its reverse (12100113224012), we get a palindrome (33142344324133).

The spelling of 21042231100121 in words is "twenty-one trillion, forty-two billion, two hundred thirty-one million, one hundred thousand, one hundred twenty-one".