2720221571 has 4 divisors (see below), whose sum is σ = 2720394600. Its totient is φ = 2720048544.

The previous prime is 2720221531. The next prime is 2720221591. The reversal of 2720221571 is 1751220272.

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

It is a cyclic number.

It is not a de Polignac number, because 2720221571 - 2¹⁸ = 2719959427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2720221501) 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, 60281 + ... + 95258.

It is an arithmetic number, because the mean of its divisors is an integer number (680098650).

Almost surely, 2^2720221571 is an apocalyptic number.

2720221571 is a deficient number, since it is larger than the sum of its proper divisors (173029).

2720221571 is a wasteful number, since it uses less digits than its factorization.

2720221571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173028.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 2720221571 is about 52155.7434133577. The cubic root of 2720221571 is about 1395.9443118304.

The spelling of 2720221571 in words is "two billion, seven hundred twenty million, two hundred twenty-one thousand, five hundred seventy-one".