256021212 has 12 divisors (see below), whose sum is σ = 597382856. Its totient is φ = 85340400.

The previous prime is 256021201. The next prime is 256021223. The reversal of 256021212 is 212120652.

It is a happy number.

256021212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256021201) and next prime (256021223).

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10667539 + ... + 10667562.

Almost surely, 2^256021212 is an apocalyptic number.

It is an amenable number.

256021212 is an abundant number, since it is smaller than the sum of its proper divisors (341361644).

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

256021212 is a wasteful number, since it uses less digits than its factorization.

256021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21335108 (or 21335106 counting only the distinct ones).

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

The square root of 256021212 is about 16000.6628612692. The cubic root of 256021212 is about 634.9779577775.

Adding to 256021212 its reverse (212120652), we get a palindrome (468141864).

The spelling of 256021212 in words is "two hundred fifty-six million, twenty-one thousand, two hundred twelve".