2021103312021 has 40 divisors (see below), whose sum is σ = 3037472702264. Its totient is φ = 1339246016640.

The previous prime is 2021103312017. The next prime is 2021103312031. The reversal of 2021103312021 is 1202133011202.

2021103312021 is a `hidden beast` number, since 20 + 2 + 110 + 331 + 202 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 298909521 + 2020804402500 = 17289^2 + 1421550^2 .

It is not a de Polignac number, because 2021103312021 - 2² = 2021103312017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021103311985 and 2021103312003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021103312031) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 28304055 + ... + 28375371.

Almost surely, 2^{2021103312021} is an apocalyptic number.

It is an amenable number.

2021103312021 is a deficient number, since it is larger than the sum of its proper divisors (1016369390243).

2021103312021 is a wasteful number, since it uses less digits than its factorization.

2021103312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73443 (or 73434 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 2021103312021 its reverse (1202133011202), we get a palindrome (3223236323223).

The spelling of 2021103312021 in words is "two trillion, twenty-one billion, one hundred three million, three hundred twelve thousand, twenty-one".