2212312261 has 4 divisors (see below), whose sum is σ = 2215189900. Its totient is φ = 2209434624.

The previous prime is 2212312259. The next prime is 2212312301. The reversal of 2212312261 is 1622132122.

It is a happy number.

2212312261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1733140161 + 479172100 = 41631^2 + 21890^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212312261 - 2¹ = 2212312259 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 (2212316261) 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, 1437666 + ... + 1439203.

It is an arithmetic number, because the mean of its divisors is an integer number (553797475).

Almost surely, 2^2212312261 is an apocalyptic number.

It is an amenable number.

2212312261 is a deficient number, since it is larger than the sum of its proper divisors (2877639).

2212312261 is an equidigital number, since it uses as much as digits as its factorization.

2212312261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2877638.

The product of its digits is 576, while the sum is 22.

The square root of 2212312261 is about 47035.2236201764. The cubic root of 2212312261 is about 1303.0131803834.

Adding to 2212312261 its reverse (1622132122), we get a palindrome (3834444383).

The spelling of 2212312261 in words is "two billion, two hundred twelve million, three hundred twelve thousand, two hundred sixty-one".