12261016221 has 16 divisors (see below), whose sum is σ = 16591974336. Its totient is φ = 8052594176.

The previous prime is 12261016211. The next prime is 12261016231.

12261016221 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (12261016211) and next prime (12261016231).

It is a cyclic number.

It is not a de Polignac number, because 12261016221 - 2⁵ = 12261016189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12261016191 and 12261016200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261016211) 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, 18151 + ... + 157643.

It is an arithmetic number, because the mean of its divisors is an integer number (1036998396).

Almost surely, 2^12261016221 is an apocalyptic number.

It is an amenable number.

12261016221 is a deficient number, since it is larger than the sum of its proper divisors (4330958115).

12261016221 is a wasteful number, since it uses less digits than its factorization.

12261016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139932.

The product of its (nonzero) digits is 576, while the sum is 24.

It can be divided in two parts, 122610 and 16221, that added together give a palindrome (138831).

The spelling of 12261016221 in words is "twelve billion, two hundred sixty-one million, sixteen thousand, two hundred twenty-one".