12021321971 has 2 divisors, whose sum is σ = 12021321972. Its totient is φ = 12021321970.

The previous prime is 12021321919. The next prime is 12021322003. The reversal of 12021321971 is 17912312021.

12021321971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12021321971 - 2²² = 12017127667 is a prime.

It is not a weakly prime, because it can be changed into another prime (12021381971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010660985 + 6010660986.

It is an arithmetic number, because the mean of its divisors is an integer number (6010660986).

Almost surely, 2^12021321971 is an apocalyptic number.

12021321971 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021321971 is an equidigital number, since it uses as much as digits as its factorization.

12021321971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

Adding to 12021321971 its reverse (17912312021), we get a palindrome (29933633992).

The spelling of 12021321971 in words is "twelve billion, twenty-one million, three hundred twenty-one thousand, nine hundred seventy-one".