2021020256021 has 32 divisors (see below), whose sum is σ = 2315484057600. Its totient is φ = 1753443816768.

The previous prime is 2021020255979. The next prime is 2021020256023. The reversal of 2021020256021 is 1206520201202.

It is a de Polignac number, because none of the positive numbers 2^k-2021020256021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021020256023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11234975 + ... + 11413443.

It is an arithmetic number, because the mean of its divisors is an integer number (72358876800).

Almost surely, 2^{2021020256021} is an apocalyptic number.

It is an amenable number.

2021020256021 is a deficient number, since it is larger than the sum of its proper divisors (294463801579).

2021020256021 is a wasteful number, since it uses less digits than its factorization.

2021020256021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178666 (or 178628 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 2021020256021 its reverse (1206520201202), we get a palindrome (3227540457223).

The spelling of 2021020256021 in words is "two trillion, twenty-one billion, twenty million, two hundred fifty-six thousand, twenty-one".