7271227521 has 28 divisors (see below), whose sum is σ = 11375874048. Its totient is φ = 4636714104.

The previous prime is 7271227517. The next prime is 7271227529. The reversal of 7271227521 is 1257221727.

It is a happy number.

7271227521 is a `hidden beast` number, since 7 + 2 + 7 + 122 + 7 + 521 = 666.

It is not a de Polignac number, because 7271227521 - 2² = 7271227517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7271227529) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 200065 + ... + 233598.

It is an arithmetic number, because the mean of its divisors is an integer number (406281216).

Almost surely, 2^7271227521 is an apocalyptic number.

It is an amenable number.

7271227521 is a deficient number, since it is larger than the sum of its proper divisors (4104646527).

7271227521 is an equidigital number, since it uses as much as digits as its factorization.

7271227521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433704 (or 433689 counting only the distinct ones).

The product of its digits is 27440, while the sum is 36.

The square root of 7271227521 is about 85271.4930149578. The cubic root of 7271227521 is about 1937.3254249145.

The spelling of 7271227521 in words is "seven billion, two hundred seventy-one million, two hundred twenty-seven thousand, five hundred twenty-one".