2721157 has 8 divisors (see below), whose sum is σ = 2845440. Its totient is φ = 2598960.

The previous prime is 2721143. The next prime is 2721163. The reversal of 2721157 is 7511272.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2721157 - 2¹⁹ = 2196869 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 (2721127) 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, 2532 + ... + 3442.

It is an arithmetic number, because the mean of its divisors is an integer number (355680).

2^2721157 is an apocalyptic number.

It is an amenable number.

2721157 is a deficient number, since it is larger than the sum of its proper divisors (124283).

2721157 is a wasteful number, since it uses less digits than its factorization.

2721157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043.

The product of its digits is 980, while the sum is 25.

The square root of 2721157 is about 1649.5929801015. The cubic root of 2721157 is about 139.6104305800.

The spelling of 2721157 in words is "two million, seven hundred twenty-one thousand, one hundred fifty-seven".