2011210261 has 2 divisors, whose sum is σ = 2011210262. Its totient is φ = 2011210260.

The previous prime is 2011210259. The next prime is 2011210277. The reversal of 2011210261 is 1620121102.

It is an a-pointer prime, because the next prime (2011210277) can be obtained adding 2011210261 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1908816100 + 102394161 = 43690^2 + 10119^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011210261 - 2¹ = 2011210259 is a prime.

It is a super-4 number, since 4×2011210261⁴ (a number of 38 digits) contains 4444 as substring.

Together with 2011210259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011210561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005605130 + 1005605131.

It is an arithmetic number, because the mean of its divisors is an integer number (1005605131).

Almost surely, 2^2011210261 is an apocalyptic number.

It is an amenable number.

2011210261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011210261 is an equidigital number, since it uses as much as digits as its factorization.

2011210261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 2011210261 is about 44846.5189396011. The cubic root of 2011210261 is about 1262.2706726684.

Adding to 2011210261 its reverse (1620121102), we get a palindrome (3631331363).

The spelling of 2011210261 in words is "two billion, eleven million, two hundred ten thousand, two hundred sixty-one".