2642921 has 4 divisors (see below), whose sum is σ = 2658372. Its totient is φ = 2627472.

The previous prime is 2642897. The next prime is 2642929. The reversal of 2642921 is 1292462.

2642921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1297321 + 1345600 = 1139^2 + 1160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2642921 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 (2642929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7466 + ... + 7811.

It is an arithmetic number, because the mean of its divisors is an integer number (664593).

2^2642921 is an apocalyptic number.

It is an amenable number.

2642921 is a deficient number, since it is larger than the sum of its proper divisors (15451).

2642921 is a wasteful number, since it uses less digits than its factorization.

2642921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15450.

The product of its digits is 1728, while the sum is 26.

The square root of 2642921 is about 1625.7063080397. The cubic root of 2642921 is about 138.2594189088.

The spelling of 2642921 in words is "two million, six hundred forty-two thousand, nine hundred twenty-one".