4247921533 has 4 divisors (see below), whose sum is σ = 4253252220. Its totient is φ = 4242590848.

The previous prime is 4247921519. The next prime is 4247921549. The reversal of 4247921533 is 3351297424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3528716409 + 719205124 = 59403^2 + 26818^2 .

It is a cyclic number.

It is not a de Polignac number, because 4247921533 - 2⁵ = 4247921501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4247921633) 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, 2664148 + ... + 2665741.

It is an arithmetic number, because the mean of its divisors is an integer number (1063313055).

Almost surely, 2^4247921533 is an apocalyptic number.

It is an amenable number.

4247921533 is a deficient number, since it is larger than the sum of its proper divisors (5330687).

4247921533 is an equidigital number, since it uses as much as digits as its factorization.

4247921533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330686.

The product of its digits is 181440, while the sum is 40.

The square root of 4247921533 is about 65176.0809883503. The cubic root of 4247921533 is about 1619.5418016512.

The spelling of 4247921533 in words is "four billion, two hundred forty-seven million, nine hundred twenty-one thousand, five hundred thirty-three".