2190621 has 8 divisors (see below), whose sum is σ = 2940064. Its totient is φ = 1450800.

The previous prime is 2190613. The next prime is 2190647. The reversal of 2190621 is 1260912.

2190621 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 not a de Polignac number, because 2190621 - 2³ = 2190613 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 (2190691) 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, 1855 + ... + 2796.

It is an arithmetic number, because the mean of its divisors is an integer number (367508).

2^2190621 is an apocalyptic number.

It is an amenable number.

2190621 is a deficient number, since it is larger than the sum of its proper divisors (749443).

2190621 is a wasteful number, since it uses less digits than its factorization.

2190621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 2190621 is about 1480.0746602790. The cubic root of 2190621 is about 129.8740594912.

The spelling of 2190621 in words is "two million, one hundred ninety thousand, six hundred twenty-one".