12021659977 has 2 divisors, whose sum is σ = 12021659978. Its totient is φ = 12021659976.

The previous prime is 12021659957. The next prime is 12021660011. The reversal of 12021659977 is 77995612021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11853983376 + 167676601 = 108876^2 + 12949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021659977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12021659977.

It is not a weakly prime, because it can be changed into another prime (12021659957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010829988 + 6010829989.

It is an arithmetic number, because the mean of its divisors is an integer number (6010829989).

Almost surely, 2^12021659977 is an apocalyptic number.

It is an amenable number.

12021659977 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021659977 is an equidigital number, since it uses as much as digits as its factorization.

12021659977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 49.

The spelling of 12021659977 in words is "twelve billion, twenty-one million, six hundred fifty-nine thousand, nine hundred seventy-seven".