12015211061 has 12 divisors (see below), whose sum is σ = 13981113900. Its totient is φ = 10295631360.

The previous prime is 12015211049. The next prime is 12015211069. The reversal of 12015211061 is 16011251021.

It can be written as a sum of positive squares in 2 ways, for example, as 6182834161 + 5832376900 = 78631^2 + 76370^2 .

It is not a de Polignac number, because 12015211061 - 2⁶ = 12015210997 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 (12015211069) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134165 + ... + 205013.

It is an arithmetic number, because the mean of its divisors is an integer number (1165092825).

Almost surely, 2^12015211061 is an apocalyptic number.

It is an amenable number.

12015211061 is a deficient number, since it is larger than the sum of its proper divisors (1965902839).

12015211061 is an equidigital number, since it uses as much as digits as its factorization.

12015211061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74324 (or 74317 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 12015211061 its reverse (16011251021), we get a palindrome (28026462082).

The spelling of 12015211061 in words is "twelve billion, fifteen million, two hundred eleven thousand, sixty-one".