21100202121101 has 4 divisors (see below), whose sum is σ = 21337283043900. Its totient is φ = 20863121198304.

The previous prime is 21100202120999. The next prime is 21100202121121. The reversal of 21100202121101 is 10112120200112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13530957618025 + 7569244503076 = 3678445^2 + 2751226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100202121101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100202121121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118540461266 + ... + 118540461443.

It is an arithmetic number, because the mean of its divisors is an integer number (5334320760975).

Almost surely, 2^{21100202121101} is an apocalyptic number.

It is an amenable number.

21100202121101 is a deficient number, since it is larger than the sum of its proper divisors (237080922799).

21100202121101 is an equidigital number, since it uses as much as digits as its factorization.

21100202121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237080922798.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21100202121101 its reverse (10112120200112), we get a palindrome (31212322321213).

The spelling of 21100202121101 in words is "twenty-one trillion, one hundred billion, two hundred two million, one hundred twenty-one thousand, one hundred one".