12020214661 has 16 divisors (see below), whose sum is σ = 14827859200. Its totient is φ = 9488803968.

The previous prime is 12020214643. The next prime is 12020214671. The reversal of 12020214661 is 16641202021.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12020214661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020214601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110496 + ... + 190393.

It is an arithmetic number, because the mean of its divisors is an integer number (926741200).

Almost surely, 2^12020214661 is an apocalyptic number.

It is an amenable number.

12020214661 is a deficient number, since it is larger than the sum of its proper divisors (2807644539).

12020214661 is a wasteful number, since it uses less digits than its factorization.

12020214661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301348.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 12020214661 its reverse (16641202021), we get a palindrome (28661416682).

The spelling of 12020214661 in words is "twelve billion, twenty million, two hundred fourteen thousand, six hundred sixty-one".