7055721 has 8 divisors (see below), whose sum is σ = 10452960. Its totient is φ = 4703796.

The previous prime is 7055701. The next prime is 7055723. The reversal of 7055721 is 1275507.

It is not a de Polignac number, because 7055721 - 2¹⁹ = 6531433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 261323 = 7055721 / (7 + 0 + 5 + 5 + 7 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (7055723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130635 + ... + 130688.

It is an arithmetic number, because the mean of its divisors is an integer number (1306620).

Almost surely, 2^7055721 is an apocalyptic number.

It is an amenable number.

7055721 is a deficient number, since it is larger than the sum of its proper divisors (3397239).

7055721 is a wasteful number, since it uses less digits than its factorization.

7055721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261332 (or 261326 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 7055721 is about 2656.2607176254. The cubic root of 7055721 is about 191.7993509322.

It can be divided in two parts, 7055 and 721, that added together give a 5-th power (7776 = 6⁵).

The spelling of 7055721 in words is "seven million, fifty-five thousand, seven hundred twenty-one".