12215131206536 has 8 divisors (see below), whose sum is σ = 22903371012270. Its totient is φ = 6107565603264.

The previous prime is 12215131206533. The next prime is 12215131206539. The reversal of 12215131206536 is 63560213151221.

It is an interprime number because it is at equal distance from previous prime (12215131206533) and next prime (12215131206539).

It can be written as a sum of positive squares in only one way, i.e., 11851288204900 + 363843001636 = 3442570^2 + 603194^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 12215131206536.

It is not an unprimeable number, because it can be changed into a prime (12215131206533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 763445700401 + ... + 763445700416.

Almost surely, 2^{12215131206536} is an apocalyptic number.

It is an amenable number.

12215131206536 is a deficient number, since it is larger than the sum of its proper divisors (10688239805734).

12215131206536 is a wasteful number, since it uses less digits than its factorization.

12215131206536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526891400823 (or 1526891400819 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

Adding to 12215131206536 its reverse (63560213151221), we get a palindrome (75775344357757).

The spelling of 12215131206536 in words is "twelve trillion, two hundred fifteen billion, one hundred thirty-one million, two hundred six thousand, five hundred thirty-six".