2021021102021 has 8 divisors (see below), whose sum is σ = 2062072780824. Its totient is φ = 1980382003200.

The previous prime is 2021021101999. The next prime is 2021021102033. The reversal of 2021021102021 is 1202011201202.

It can be written as a sum of positive squares in 4 ways, for example, as 333749999521 + 1687271102500 = 577711^2 + 1298950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021021102021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021021101987 and 2021021102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021021162021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103135100 + ... + 103154693.

It is an arithmetic number, because the mean of its divisors is an integer number (257759097603).

Almost surely, 2^{2021021102021} is an apocalyptic number.

It is an amenable number.

2021021102021 is a deficient number, since it is larger than the sum of its proper divisors (41051678803).

2021021102021 is a wasteful number, since it uses less digits than its factorization.

2021021102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206289991.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2021021102021 its reverse (1202011201202), we get a palindrome (3223032303223).

The spelling of 2021021102021 in words is "two trillion, twenty-one billion, twenty-one million, one hundred two thousand, twenty-one".