2680921 has 4 divisors (see below), whose sum is σ = 2743312. Its totient is φ = 2618532.

The previous prime is 2680907. The next prime is 2680943. The reversal of 2680921 is 1290862.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1290862 = 2 ⋅645431.

It is a cyclic number.

It is not a de Polignac number, because 2680921 - 2⁹ = 2680409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2680921.

It is not an unprimeable number, because it can be changed into a prime (2680961) 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, 31131 + ... + 31216.

It is an arithmetic number, because the mean of its divisors is an integer number (685828).

2^2680921 is an apocalyptic number.

It is an amenable number.

2680921 is a deficient number, since it is larger than the sum of its proper divisors (62391).

2680921 is an equidigital number, since it uses as much as digits as its factorization.

2680921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62390.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2680921 is about 1637.3518253570. The cubic root of 2680921 is about 138.9189009869.

The spelling of 2680921 in words is "two million, six hundred eighty thousand, nine hundred twenty-one".