2100002101121 has 4 divisors (see below), whose sum is σ = 2100011359044. Its totient is φ = 2099992843200.

The previous prime is 2100002101097. The next prime is 2100002101151. The reversal of 2100002101121 is 1211012000012.

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 2027662081600 + 72340019521 = 1423960^2 + 268961^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100002101121 - 2²⁶ = 2099934992257 is a prime.

It is a super-2 number, since 2×2100002101121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2100002101151) 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, 4279940 + ... + 4745301.

It is an arithmetic number, because the mean of its divisors is an integer number (525002839761).

Almost surely, 2^{2100002101121} is an apocalyptic number.

It is an amenable number.

2100002101121 is a deficient number, since it is larger than the sum of its proper divisors (9257923).

2100002101121 is an equidigital number, since it uses as much as digits as its factorization.

2100002101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9257922.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2100002101121 its reverse (1211012000012), we get a palindrome (3311014101133).

The spelling of 2100002101121 in words is "two trillion, one hundred billion, two million, one hundred one thousand, one hundred twenty-one".