7122721547 has 8 divisors (see below), whose sum is σ = 7240904112. Its totient is φ = 7004584800.

The previous prime is 7122721483. The next prime is 7122721561. The reversal of 7122721547 is 7451272217.

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

It is a cyclic number.

It is not a de Polignac number, because 7122721547 - 2⁶ = 7122721483 is a prime.

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 7122721547.

It is not an unprimeable number, because it can be changed into a prime (7122720547) 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, 463172 + ... + 478302.

It is an arithmetic number, because the mean of its divisors is an integer number (905113014).

Almost surely, 2^7122721547 is an apocalyptic number.

7122721547 is a deficient number, since it is larger than the sum of its proper divisors (118182565).

7122721547 is a wasteful number, since it uses less digits than its factorization.

7122721547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22909.

The product of its digits is 54880, while the sum is 38.

The square root of 7122721547 is about 84396.2176107437. The cubic root of 7122721547 is about 1924.0454296431.

The spelling of 7122721547 in words is "seven billion, one hundred twenty-two million, seven hundred twenty-one thousand, five hundred forty-seven".