2721001 has 4 divisors (see below), whose sum is σ = 2741904. Its totient is φ = 2700100.

The previous prime is 2720999. The next prime is 2721007. The reversal of 2721001 is 1001272.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2721001 - 2¹ = 2720999 is a prime.

It is a Duffinian number.

2721001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2721007) 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, 10255 + ... + 10516.

It is an arithmetic number, because the mean of its divisors is an integer number (685476).

2^2721001 is an apocalyptic number.

It is an amenable number.

2721001 is a deficient number, since it is larger than the sum of its proper divisors (20903).

2721001 is a wasteful number, since it uses less digits than its factorization.

2721001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20902.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 2721001 is about 1649.5456950324. The cubic root of 2721001 is about 139.6077626409.

Adding to 2721001 its reverse (1001272), we get a palindrome (3722273).

It can be divided in two parts, 272 and 1001, that multiplied together give a palindrome (272272).

The spelling of 2721001 in words is "two million, seven hundred twenty-one thousand, one".