21101232100121 has 8 divisors (see below), whose sum is σ = 21441265802880. Its totient is φ = 20763021634992.

The previous prime is 21101232100111. The next prime is 21101232100129. The reversal of 21101232100121 is 12100123210112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21101232100121 - 2¹⁰ = 21101232099097 is a prime.

It is a super-2 number, since 2×21101232100121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101232100121.

It is not an unprimeable number, because it can be changed into a prime (21101232100129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455786075 + ... + 455832368.

It is an arithmetic number, because the mean of its divisors is an integer number (2680158225360).

Almost surely, 2^{21101232100121} is an apocalyptic number.

It is an amenable number.

21101232100121 is a deficient number, since it is larger than the sum of its proper divisors (340033702759).

21101232100121 is an equidigital number, since it uses as much as digits as its factorization.

21101232100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911618815.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21101232100121 its reverse (12100123210112), we get a palindrome (33201355310233).

The spelling of 21101232100121 in words is "twenty-one trillion, one hundred one billion, two hundred thirty-two million, one hundred thousand, one hundred twenty-one".