12021612049 has 2 divisors, whose sum is σ = 12021612050. Its totient is φ = 12021612048.

The previous prime is 12021611957. The next prime is 12021612073. The reversal of 12021612049 is 94021612021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11418418449 + 603193600 = 106857^2 + 24560^2 .

It is an emirp because it is prime and its reverse (94021612021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12021612049 - 2²⁵ = 11988057617 is a prime.

It is not a weakly prime, because it can be changed into another prime (12021612649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010806024 + 6010806025.

It is an arithmetic number, because the mean of its divisors is an integer number (6010806025).

Almost surely, 2^12021612049 is an apocalyptic number.

It is an amenable number.

12021612049 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021612049 is an equidigital number, since it uses as much as digits as its factorization.

12021612049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

Subtracting from 12021612049 its sum of digits (28), we obtain a palindrome (12021612021).

The spelling of 12021612049 in words is "twelve billion, twenty-one million, six hundred twelve thousand, forty-nine".