4256021213 has 6 divisors (see below), whose sum is σ = 4521102426. Its totient is φ = 4005666752.

The previous prime is 4256021183. The next prime is 4256021233. The reversal of 4256021213 is 3121206524.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2826198244 + 1429822969 = 53162^2 + 37813^2 .

It is not a de Polignac number, because 4256021213 - 2²⁴ = 4239243997 is a prime.

It is a super-2 number, since 2×4256021213² = 36227433131011982738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4256021233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7363070 + ... + 7363647.

It is an arithmetic number, because the mean of its divisors is an integer number (753517071).

Almost surely, 2^4256021213 is an apocalyptic number.

It is an amenable number.

4256021213 is a deficient number, since it is larger than the sum of its proper divisors (265081213).

4256021213 is a wasteful number, since it uses less digits than its factorization.

4256021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14726751 (or 14726734 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 4256021213 is about 65238.1883025579. The cubic root of 4256021213 is about 1620.5704962467.

Adding to 4256021213 its reverse (3121206524), we get a palindrome (7377227737).

The spelling of 4256021213 in words is "four billion, two hundred fifty-six million, twenty-one thousand, two hundred thirteen".