12021009881 has 2 divisors, whose sum is σ = 12021009882. Its totient is φ = 12021009880.

The previous prime is 12021009829. The next prime is 12021009899. The reversal of 12021009881 is 18890012021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8219054281 + 3801955600 = 90659^2 + 61660^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021009881 - 2⁶ = 12021009817 is a prime.

It is a super-4 number, since 4×12021009881⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (12021009821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010504940 + 6010504941.

It is an arithmetic number, because the mean of its divisors is an integer number (6010504941).

Almost surely, 2^12021009881 is an apocalyptic number.

It is an amenable number.

12021009881 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021009881 is an equidigital number, since it uses as much as digits as its factorization.

12021009881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 12021009881 in words is "twelve billion, twenty-one million, nine thousand, eight hundred eighty-one".