12021987293 has 2 divisors, whose sum is σ = 12021987294. Its totient is φ = 12021987292.

The previous prime is 12021987233. The next prime is 12021987331. The reversal of 12021987293 is 39278912021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9144523129 + 2877464164 = 95627^2 + 53642^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021987293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021987233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010993646 + 6010993647.

It is an arithmetic number, because the mean of its divisors is an integer number (6010993647).

Almost surely, 2^12021987293 is an apocalyptic number.

It is an amenable number.

12021987293 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021987293 is an equidigital number, since it uses as much as digits as its factorization.

12021987293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 12021987293 in words is "twelve billion, twenty-one million, nine hundred eighty-seven thousand, two hundred ninety-three".