2122561 has 8 divisors (see below), whose sum is σ = 2453760. Its totient is φ = 1798368.

The previous prime is 2122553. The next prime is 2122573. The reversal of 2122561 is 1652212.

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 2122561 - 2³ = 2122553 is a prime.

It is a super-3 number, since 3×2122561³ = 28688100616387333443, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2122511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1081 + ... + 2326.

It is an arithmetic number, because the mean of its divisors is an integer number (306720).

2^2122561 is an apocalyptic number.

It is an amenable number.

2122561 is a deficient number, since it is larger than the sum of its proper divisors (331199).

2122561 is an equidigital number, since it uses as much as digits as its factorization.

2122561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503.

The product of its digits is 240, while the sum is 19.

The square root of 2122561 is about 1456.9011634287. The cubic root of 2122561 is about 128.5148735982.

Adding to 2122561 its reverse (1652212), we get a palindrome (3774773).

The spelling of 2122561 in words is "two million, one hundred twenty-two thousand, five hundred sixty-one".