12121220653 has 2 divisors, whose sum is σ = 12121220654. Its totient is φ = 12121220652.

The previous prime is 12121220633. The next prime is 12121220707. The reversal of 12121220653 is 35602212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10192517764 + 1928702889 = 100958^2 + 43917^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121220653 - 2⁵ = 12121220621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121220623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060610326 + 6060610327.

It is an arithmetic number, because the mean of its divisors is an integer number (6060610327).

Almost surely, 2^12121220653 is an apocalyptic number.

It is an amenable number.

12121220653 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121220653 is an equidigital number, since it uses as much as digits as its factorization.

12121220653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 12121220653 its reverse (35602212121), we get a palindrome (47723432774).

The spelling of 12121220653 in words is "twelve billion, one hundred twenty-one million, two hundred twenty thousand, six hundred fifty-three".