2021100210121 has 4 divisors (see below), whose sum is σ = 2025522749332. Its totient is φ = 2016677670912.

The previous prime is 2021100210113. The next prime is 2021100210221. The reversal of 2021100210121 is 1210120011202.

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 1281605126400 + 739495083721 = 1132080^2 + 859939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021100210121 - 2³ = 2021100210113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021100210221) 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, 2211268920 + ... + 2211269833.

It is an arithmetic number, because the mean of its divisors is an integer number (506380687333).

Almost surely, 2^{2021100210121} is an apocalyptic number.

It is an amenable number.

2021100210121 is a deficient number, since it is larger than the sum of its proper divisors (4422539211).

2021100210121 is an equidigital number, since it uses as much as digits as its factorization.

2021100210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4422539210.

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

Adding to 2021100210121 its reverse (1210120011202), we get a palindrome (3231220221323).

The spelling of 2021100210121 in words is "two trillion, twenty-one billion, one hundred million, two hundred ten thousand, one hundred twenty-one".