2101001202121 has 4 divisors (see below), whose sum is σ = 2101757777172. Its totient is φ = 2100244627072.

The previous prime is 2101001202061. The next prime is 2101001202163. The reversal of 2101001202121 is 1212021001012.

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 782720631225 + 1318280570896 = 884715^2 + 1148164^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101001202121 - 2¹⁵ = 2101001169353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101001202821) 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, 378283360 + ... + 378288913.

It is an arithmetic number, because the mean of its divisors is an integer number (525439444293).

Almost surely, 2^{2101001202121} is an apocalyptic number.

It is an amenable number.

2101001202121 is a deficient number, since it is larger than the sum of its proper divisors (756575051).

2101001202121 is an equidigital number, since it uses as much as digits as its factorization.

2101001202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756575050.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2101001202121 its reverse (1212021001012), we get a palindrome (3313022203133).

The spelling of 2101001202121 in words is "two trillion, one hundred one billion, one million, two hundred two thousand, one hundred twenty-one".