2021021221021 has 8 divisors (see below), whose sum is σ = 2204804784384. Its totient is φ = 1837246717920.

The previous prime is 2021021221001. The next prime is 2021021221027. The reversal of 2021021221021 is 1201221201202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2021021221021 - 2⁵ = 2021021220989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021021220986 and 2021021221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021021221027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1794400 + ... + 2694793.

It is an arithmetic number, because the mean of its divisors is an integer number (275600598048).

Almost surely, 2^{2021021221021} is an apocalyptic number.

It is an amenable number.

2021021221021 is a deficient number, since it is larger than the sum of its proper divisors (183783563363).

2021021221021 is a wasteful number, since it uses less digits than its factorization.

2021021221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4530131.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021021221021 its reverse (1201221201202), we get a palindrome (3222242422223).

The spelling of 2021021221021 in words is "two trillion, twenty-one billion, twenty-one million, two hundred twenty-one thousand, twenty-one".