2221815 has 16 divisors (see below), whose sum is σ = 3764448. Its totient is φ = 1115136.

The previous prime is 2221789. The next prime is 2221829. The reversal of 2221815 is 5181222.

It is a happy number.

It is not a de Polignac number, because 2221815 - 2¹³ = 2213623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221791 and 2221800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4102 + ... + 4611.

It is an arithmetic number, because the mean of its divisors is an integer number (235278).

2^2221815 is an apocalyptic number.

2221815 is a deficient number, since it is larger than the sum of its proper divisors (1542633).

2221815 is a wasteful number, since it uses less digits than its factorization.

2221815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8738.

The product of its digits is 320, while the sum is 21.

The square root of 2221815 is about 1490.5753922563. The cubic root of 2221815 is about 130.4876164465.

The spelling of 2221815 in words is "two million, two hundred twenty-one thousand, eight hundred fifteen".