256767221020 has 12 divisors (see below), whose sum is σ = 539211164184. Its totient is φ = 102706888400.

The previous prime is 256767221017. The next prime is 256767221021. The reversal of 256767221020 is 20122767652.

256767221020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256767221021) 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, 6419180506 + ... + 6419180545.

It is an arithmetic number, because the mean of its divisors is an integer number (44934263682).

Almost surely, 2^256767221020 is an apocalyptic number.

256767221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256767221020 is an abundant number, since it is smaller than the sum of its proper divisors (282443943164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256767221020 is a wasteful number, since it uses less digits than its factorization.

256767221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12838361060 (or 12838361058 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

Adding to 256767221020 its reverse (20122767652), we get a palindrome (276889988672).

The spelling of 256767221020 in words is "two hundred fifty-six billion, seven hundred sixty-seven million, two hundred twenty-one thousand, twenty".