2212661 has 4 divisors (see below), whose sum is σ = 2413824. Its totient is φ = 2011500.

The previous prime is 2212657. The next prime is 2212663. The reversal of 2212661 is 1662122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2212661 - 2² = 2212657 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 (2212663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100565 + ... + 100586.

It is an arithmetic number, because the mean of its divisors is an integer number (603456).

2^2212661 is an apocalyptic number.

It is an amenable number.

2212661 is a deficient number, since it is larger than the sum of its proper divisors (201163).

2212661 is a wasteful number, since it uses less digits than its factorization.

2212661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201162.

The product of its digits is 288, while the sum is 20.

The square root of 2212661 is about 1487.5015966378. The cubic root of 2212661 is about 130.3081643841.

Adding to 2212661 its reverse (1662122), we get a palindrome (3874783).

It can be divided in two parts, 221 and 2661, that added together give a palindrome (2882).

The spelling of 2212661 in words is "two million, two hundred twelve thousand, six hundred sixty-one".