12020156571 has 32 divisors (see below), whose sum is σ = 16661090880. Its totient is φ = 7704080384.

The previous prime is 12020156543. The next prime is 12020156581. The reversal of 12020156571 is 17565102021.

It is a cyclic number.

It is not a de Polignac number, because 12020156571 - 2⁵ = 12020156539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12020156501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1595305 + ... + 1602821.

It is an arithmetic number, because the mean of its divisors is an integer number (520659090).

Almost surely, 2^12020156571 is an apocalyptic number.

12020156571 is a deficient number, since it is larger than the sum of its proper divisors (4640934309).

12020156571 is a wasteful number, since it uses less digits than its factorization.

12020156571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7775.

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 12020156571 its reverse (17565102021), we get a palindrome (29585258592).

The spelling of 12020156571 in words is "twelve billion, twenty million, one hundred fifty-six thousand, five hundred seventy-one".