2101010021021 has 4 divisors (see below), whose sum is σ = 2110184737500. Its totient is φ = 2091835304544.

The previous prime is 2101010020997. The next prime is 2101010021063. The reversal of 2101010021021 is 1201200101012.

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 1576456024900 + 524553996121 = 1255570^2 + 724261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101010021021 - 2⁶ = 2101010020957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101010020993 and 2101010021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101010021321) 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, 4587357896 + ... + 4587358353.

It is an arithmetic number, because the mean of its divisors is an integer number (527546184375).

Almost surely, 2^{2101010021021} is an apocalyptic number.

It is an amenable number.

2101010021021 is a deficient number, since it is larger than the sum of its proper divisors (9174716479).

2101010021021 is an equidigital number, since it uses as much as digits as its factorization.

2101010021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9174716478.

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

Adding to 2101010021021 its reverse (1201200101012), we get a palindrome (3302210122033).

The spelling of 2101010021021 in words is "two trillion, one hundred one billion, ten million, twenty-one thousand, twenty-one".