2012216261 has 16 divisors (see below), whose sum is σ = 2364426240. Its totient is φ = 1692699120.

The previous prime is 2012216221. The next prime is 2012216267. The reversal of 2012216261 is 1626122102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2012216261 - 2⁶ = 2012216197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012216267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102965 + ... + 120938.

It is an arithmetic number, because the mean of its divisors is an integer number (147776640).

Almost surely, 2^2012216261 is an apocalyptic number.

It is an amenable number.

2012216261 is a deficient number, since it is larger than the sum of its proper divisors (352209979).

2012216261 is a wasteful number, since it uses less digits than its factorization.

2012216261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223976.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2012216261 is about 44857.7335695864. The cubic root of 2012216261 is about 1262.4810986420.

Adding to 2012216261 its reverse (1626122102), we get a palindrome (3638338363).

The spelling of 2012216261 in words is "two billion, twelve million, two hundred sixteen thousand, two hundred sixty-one".