2021210100121 has 4 divisors (see below), whose sum is σ = 2021232343312. Its totient is φ = 2021187856932.

The previous prime is 2021210100071. The next prime is 2021210100139. The reversal of 2021210100121 is 1210010121202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021210100121 - 2¹¹ = 2021210098073 is a prime.

It is a super-2 number, since 2×2021210100121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021210190121) 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 3 ways as a sum of consecutive naturals, for example, 10984731 + ... + 11167216.

It is an arithmetic number, because the mean of its divisors is an integer number (505308085828).

Almost surely, 2^{2021210100121} is an apocalyptic number.

It is an amenable number.

2021210100121 is a deficient number, since it is larger than the sum of its proper divisors (22243191).

2021210100121 is an equidigital number, since it uses as much as digits as its factorization.

2021210100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22243190.

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

Adding to 2021210100121 its reverse (1210010121202), we get a palindrome (3231220221323).

The spelling of 2021210100121 in words is "two trillion, twenty-one billion, two hundred ten million, one hundred thousand, one hundred twenty-one".