2012721261 has 8 divisors (see below), whose sum is σ = 2689827840. Its totient is φ = 1338714432.

The previous prime is 2012721259. The next prime is 2012721289. The reversal of 2012721261 is 1621272102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2012721261 - 2¹ = 2012721259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012721461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773421 + ... + 776018.

It is an arithmetic number, because the mean of its divisors is an integer number (336228480).

Almost surely, 2^2012721261 is an apocalyptic number.

It is an amenable number.

2012721261 is a deficient number, since it is larger than the sum of its proper divisors (677106579).

2012721261 is a wasteful number, since it uses less digits than its factorization.

2012721261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549875.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 2012721261 is about 44863.3621232292. The cubic root of 2012721261 is about 1262.5867035314.

Adding to 2012721261 its reverse (1621272102), we get a palindrome (3633993363).

The spelling of 2012721261 in words is "two billion, twelve million, seven hundred twenty-one thousand, two hundred sixty-one".