2101010121101 has 4 divisors (see below), whose sum is σ = 2224598951772. Its totient is φ = 1977421290432.

The previous prime is 2101010121079. The next prime is 2101010121103. The reversal of 2101010121101 is 1011210101012.

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 1746388680100 + 354621441001 = 1321510^2 + 595501^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101010121101 - 2⁶ = 2101010121037 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 (2101010121103) 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, 61794415310 + ... + 61794415343.

It is an arithmetic number, because the mean of its divisors is an integer number (556149737943).

Almost surely, 2^{2101010121101} is an apocalyptic number.

It is an amenable number.

2101010121101 is a deficient number, since it is larger than the sum of its proper divisors (123588830671).

2101010121101 is a wasteful number, since it uses less digits than its factorization.

2101010121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123588830670.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 2101010121101 its reverse (1011210101012), we get a palindrome (3112220222113).

The spelling of 2101010121101 in words is "two trillion, one hundred one billion, ten million, one hundred twenty-one thousand, one hundred one".