2123566 has 4 divisors (see below), whose sum is σ = 3185352. Its totient is φ = 1061782.

The previous prime is 2123557. The next prime is 2123581. The reversal of 2123566 is 6653212.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2123566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530890 + ... + 530893.

It is an arithmetic number, because the mean of its divisors is an integer number (796338).

2^2123566 is an apocalyptic number.

2123566 is a deficient number, since it is larger than the sum of its proper divisors (1061786).

2123566 is a wasteful number, since it uses less digits than its factorization.

2123566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061785.

The product of its digits is 2160, while the sum is 25.

The square root of 2123566 is about 1457.2460327618. The cubic root of 2123566 is about 128.5351536700.

Adding to 2123566 its reverse (6653212), we get a palindrome (8776778).

The spelling of 2123566 in words is "two million, one hundred twenty-three thousand, five hundred sixty-six".