2145621 has 8 divisors (see below), whose sum is σ = 3029184. Its totient is φ = 1346240.

The previous prime is 2145617. The next prime is 2145629. The reversal of 2145621 is 1265412.

2145621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2145621 - 2² = 2145617 is a prime.

It is a super-3 number, since 3×2145621³ = 29633318449242954183, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145629) 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 7 ways as a sum of consecutive naturals, for example, 20985 + ... + 21086.

It is an arithmetic number, because the mean of its divisors is an integer number (378648).

2^2145621 is an apocalyptic number.

It is an amenable number.

2145621 is a deficient number, since it is larger than the sum of its proper divisors (883563).

2145621 is a wasteful number, since it uses less digits than its factorization.

2145621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42091.

The product of its digits is 480, while the sum is 21.

The square root of 2145621 is about 1464.7938421498. The cubic root of 2145621 is about 128.9786035061.

The spelling of 2145621 in words is "two million, one hundred forty-five thousand, six hundred twenty-one".