21102100202121 has 8 divisors (see below), whose sum is σ = 28166749638720. Its totient is φ = 14052758783472.

The previous prime is 21102100202089. The next prime is 21102100202137. The reversal of 21102100202121 is 12120200120112.

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

It is not a de Polignac number, because 21102100202121 - 2⁵ = 21102100202089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21102100202121.

It is not an unprimeable number, because it can be changed into a prime (21102100202621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3827001270 + ... + 3827006783.

It is an arithmetic number, because the mean of its divisors is an integer number (3520843704840).

Almost surely, 2^{21102100202121} is an apocalyptic number.

It is an amenable number.

21102100202121 is a deficient number, since it is larger than the sum of its proper divisors (7064649436599).

21102100202121 is an equidigital number, since it uses as much as digits as its factorization.

21102100202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7654008975.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21102100202121 its reverse (12120200120112), we get a palindrome (33222300322233).

The spelling of 21102100202121 in words is "twenty-one trillion, one hundred two billion, one hundred million, two hundred two thousand, one hundred twenty-one".