2721240457 has 4 divisors (see below), whose sum is σ = 2930566660. Its totient is φ = 2511914256.

The previous prime is 2721240449. The next prime is 2721240497. The reversal of 2721240457 is 7540421272.

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

It can be written as a sum of positive squares in 2 ways, for example, as 598242681 + 2122997776 = 24459^2 + 46076^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721240457 - 2³ = 2721240449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2721240497) 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, 104663082 + ... + 104663107.

It is an arithmetic number, because the mean of its divisors is an integer number (732641665).

Almost surely, 2^2721240457 is an apocalyptic number.

It is an amenable number.

2721240457 is a deficient number, since it is larger than the sum of its proper divisors (209326203).

2721240457 is a wasteful number, since it uses less digits than its factorization.

2721240457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209326202.

The product of its (nonzero) digits is 31360, while the sum is 34.

The square root of 2721240457 is about 52165.5102246686. The cubic root of 2721240457 is about 1396.1185783422.

The spelling of 2721240457 in words is "two billion, seven hundred twenty-one million, two hundred forty thousand, four hundred fifty-seven".