256121022 has 8 divisors (see below), whose sum is σ = 512242056. Its totient is φ = 85373672.

The previous prime is 256120981. The next prime is 256121023. The reversal of 256121022 is 220121652.

It is a happy number.

256121022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

256121022 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 256121022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256121023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21343413 + ... + 21343424.

It is an arithmetic number, because the mean of its divisors is an integer number (64030257).

Almost surely, 2^256121022 is an apocalyptic number.

256121022 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256121022 is a wasteful number, since it uses less digits than its factorization.

256121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42686842.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 256121022 is about 16003.7814906353. The cubic root of 256121022 is about 635.0604625504.

Adding to 256121022 its reverse (220121652), we get a palindrome (476242674).

It can be divided in two parts, 256 and 121022, that added together give a triangular number (121278 = T₄₉₂).

The spelling of 256121022 in words is "two hundred fifty-six million, one hundred twenty-one thousand, twenty-two".