2021256338601 has 4 divisors (see below), whose sum is σ = 2695008451472. Its totient is φ = 1347504225732.

The previous prime is 2021256338561. The next prime is 2021256338657. The reversal of 2021256338601 is 1068336521202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2021256338601 - 2⁶ = 2021256338537 is a prime.

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 2021256338601.

It is not an unprimeable number, because it can be changed into a prime (2021256338681) 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, 336876056431 + ... + 336876056436.

It is an arithmetic number, because the mean of its divisors is an integer number (673752112868).

Almost surely, 2^{2021256338601} is an apocalyptic number.

It is an amenable number.

2021256338601 is a deficient number, since it is larger than the sum of its proper divisors (673752112871).

2021256338601 is an equidigital number, since it uses as much as digits as its factorization.

2021256338601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673752112870.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 2021256338601 in words is "two trillion, twenty-one billion, two hundred fifty-six million, three hundred thirty-eight thousand, six hundred one".