13620212261 has 4 divisors (see below), whose sum is σ = 13877197452. Its totient is φ = 13363227072.

The previous prime is 13620212257. The next prime is 13620212267. The reversal of 13620212261 is 16221202631.

It is a happy number.

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 9777452161 + 3842760100 = 98881^2 + 61990^2 .

It is a cyclic number.

It is not a de Polignac number, because 13620212261 - 2² = 13620212257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13620212261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13620212267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128492516 + ... + 128492621.

It is an arithmetic number, because the mean of its divisors is an integer number (3469299363).

Almost surely, 2^13620212261 is an apocalyptic number.

It is an amenable number.

13620212261 is a deficient number, since it is larger than the sum of its proper divisors (256985191).

13620212261 is an equidigital number, since it uses as much as digits as its factorization.

13620212261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256985190.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 13620212261 its reverse (16221202631), we get a palindrome (29841414892).

The spelling of 13620212261 in words is "thirteen billion, six hundred twenty million, two hundred twelve thousand, two hundred sixty-one".