12011221566231 has 16 divisors (see below), whose sum is σ = 16551660840960. Its totient is φ = 7739759388960.

The previous prime is 12011221566131. The next prime is 12011221566269. The reversal of 12011221566231 is 13266512211021.

It is not a de Polignac number, because 12011221566231 - 2⁹ = 12011221565719 is a prime.

It is a super-2 number, since 2×12011221566231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12011221566192 and 12011221566201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011221566031) 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, 78388176 + ... + 78541253.

It is an arithmetic number, because the mean of its divisors is an integer number (1034478802560).

Almost surely, 2^{12011221566231} is an apocalyptic number.

12011221566231 is a deficient number, since it is larger than the sum of its proper divisors (4540439274729).

12011221566231 is a wasteful number, since it uses less digits than its factorization.

12011221566231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156930286.

The product of its (nonzero) digits is 8640, while the sum is 33.

Adding to 12011221566231 its reverse (13266512211021), we get a palindrome (25277733777252).

The spelling of 12011221566231 in words is "twelve trillion, eleven billion, two hundred twenty-one million, five hundred sixty-six thousand, two hundred thirty-one".