2021321311021 has 16 divisors (see below), whose sum is σ = 2179792944000. Its totient is φ = 1868066496000.

The previous prime is 2021321311001. The next prime is 2021321311123. The reversal of 2021321311021 is 1201131231202.

It is a cyclic number.

It is not a de Polignac number, because 2021321311021 - 2⁷ = 2021321310893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021321311021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021321311001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9278496 + ... + 9493846.

It is an arithmetic number, because the mean of its divisors is an integer number (136237059000).

Almost surely, 2^{2021321311021} is an apocalyptic number.

It is an amenable number.

2021321311021 is a deficient number, since it is larger than the sum of its proper divisors (158471632979).

2021321311021 is a wasteful number, since it uses less digits than its factorization.

2021321311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227460.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2021321311021 its reverse (1201131231202), we get a palindrome (3222452542223).

The spelling of 2021321311021 in words is "two trillion, twenty-one billion, three hundred twenty-one million, three hundred eleven thousand, twenty-one".