20121344606261 has 4 divisors (see below), whose sum is σ = 20121478632000. Its totient is φ = 20121210580524.

The previous prime is 20121344606257. The next prime is 20121344606263. The reversal of 20121344606261 is 16260644312102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121344606261 - 2² = 20121344606257 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 (20121344606263) 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, 66787421 + ... + 67088018.

It is an arithmetic number, because the mean of its divisors is an integer number (5030369658000).

Almost surely, 2^{20121344606261} is an apocalyptic number.

It is an amenable number.

20121344606261 is a deficient number, since it is larger than the sum of its proper divisors (134025739).

20121344606261 is a wasteful number, since it uses less digits than its factorization.

20121344606261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134025738.

The product of its (nonzero) digits is 82944, while the sum is 38.

Adding to 20121344606261 its reverse (16260644312102), we get a palindrome (36381988918363).

The spelling of 20121344606261 in words is "twenty trillion, one hundred twenty-one billion, three hundred forty-four million, six hundred six thousand, two hundred sixty-one".