4256216255021 has 8 divisors (see below), whose sum is σ = 4300178568504. Its totient is φ = 4212255651840.

The previous prime is 4256216254991. The next prime is 4256216255023. The reversal of 4256216255021 is 1205526126524.

It can be written as a sum of positive squares in 4 ways, for example, as 1192715173225 + 3063501081796 = 1092115^2 + 1750286^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4256216255021 is a prime.

It is a super-2 number, since 2×4256216255021² (a number of 26 digits) contains 22 as substring.

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 4256216255021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4256216255023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4918691 + ... + 5718911.

It is an arithmetic number, because the mean of its divisors is an integer number (537522321063).

Almost surely, 2^{4256216255021} is an apocalyptic number.

It is an amenable number.

4256216255021 is a deficient number, since it is larger than the sum of its proper divisors (43962313483).

4256216255021 is an equidigital number, since it uses as much as digits as its factorization.

4256216255021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855151.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 4256216255021 in words is "four trillion, two hundred fifty-six billion, two hundred sixteen million, two hundred fifty-five thousand, twenty-one".