2021321303131 has 4 divisors (see below), whose sum is σ = 2176807557232. Its totient is φ = 1865835049032.

The previous prime is 2021321303123. The next prime is 2021321303143. The reversal of 2021321303131 is 1313031231202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021321303131 - 2³ = 2021321303123 is a prime.

It is a super-2 number, since 2×2021321303131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021321303101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77743127031 + ... + 77743127056.

It is an arithmetic number, because the mean of its divisors is an integer number (544201889308).

Almost surely, 2^{2021321303131} is an apocalyptic number.

2021321303131 is a deficient number, since it is larger than the sum of its proper divisors (155486254101).

2021321303131 is a wasteful number, since it uses less digits than its factorization.

2021321303131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155486254100.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 2021321303131 its reverse (1313031231202), we get a palindrome (3334352534333).

The spelling of 2021321303131 in words is "two trillion, twenty-one billion, three hundred twenty-one million, three hundred three thousand, one hundred thirty-one".