2720515221 has 8 divisors (see below), whose sum is σ = 4030392960. Its totient is φ = 1813676796.

The previous prime is 2720515199. The next prime is 2720515229. The reversal of 2720515221 is 1225150272.

It is not a de Polignac number, because 2720515221 - 2¹⁰ = 2720514197 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: 100759823 = 2720515221 / (2 + 7 + 2 + 0 + 5 + 1 + 5 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720515229) 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, 50379885 + ... + 50379938.

It is an arithmetic number, because the mean of its divisors is an integer number (503799120).

Almost surely, 2^2720515221 is an apocalyptic number.

It is an amenable number.

2720515221 is a deficient number, since it is larger than the sum of its proper divisors (1309877739).

2720515221 is a wasteful number, since it uses less digits than its factorization.

2720515221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100759832 (or 100759826 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 2720515221 is about 52158.5584635925. The cubic root of 2720515221 is about 1395.9945411086.

Adding to 2720515221 its reverse (1225150272), we get a palindrome (3945665493).

The spelling of 2720515221 in words is "two billion, seven hundred twenty million, five hundred fifteen thousand, two hundred twenty-one".