2725615021 has 4 divisors (see below), whose sum is σ = 2737517500. Its totient is φ = 2713712544.

The previous prime is 2725615019. The next prime is 2725615043. The reversal of 2725615021 is 1205165272.

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 1414812996 + 1310802025 = 37614^2 + 36205^2 .

It is a cyclic number.

It is not a de Polignac number, because 2725615021 - 2¹ = 2725615019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2725615051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5950896 + ... + 5951353.

It is an arithmetic number, because the mean of its divisors is an integer number (684379375).

Almost surely, 2^2725615021 is an apocalyptic number.

It is an amenable number.

2725615021 is a deficient number, since it is larger than the sum of its proper divisors (11902479).

2725615021 is a wasteful number, since it uses less digits than its factorization.

2725615021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11902478.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 2725615021 is about 52207.4230450039. The cubic root of 2725615021 is about 1396.8662937570.

The spelling of 2725615021 in words is "two billion, seven hundred twenty-five million, six hundred fifteen thousand, twenty-one".