4271820721 has 4 divisors (see below), whose sum is σ = 4882080832. Its totient is φ = 3661560612.

The previous prime is 4271820703. The next prime is 4271820743. The reversal of 4271820721 is 1270281724.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4271820721 - 2⁵ = 4271820689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4271820121) 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, 305130045 + ... + 305130058.

It is an arithmetic number, because the mean of its divisors is an integer number (1220520208).

Almost surely, 2^4271820721 is an apocalyptic number.

It is an amenable number.

4271820721 is a deficient number, since it is larger than the sum of its proper divisors (610260111).

4271820721 is an equidigital number, since it uses as much as digits as its factorization.

4271820721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610260110.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 4271820721 is about 65359.1670770061. The cubic root of 4271820721 is about 1622.5733526824.

The spelling of 4271820721 in words is "four billion, two hundred seventy-one million, eight hundred twenty thousand, seven hundred twenty-one".