12121653 has 8 divisors (see below), whose sum is σ = 16200000. Its totient is φ = 8062208.

The previous prime is 12121631. The next prime is 12121661. The reversal of 12121653 is 35612121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121653 - 2¹⁰ = 12120629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3153 + ... + 5846.

It is an arithmetic number, because the mean of its divisors is an integer number (2025000).

Almost surely, 2^12121653 is an apocalyptic number.

It is an amenable number.

12121653 is a deficient number, since it is larger than the sum of its proper divisors (4078347).

12121653 is an equidigital number, since it uses as much as digits as its factorization.

12121653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451.

The product of its digits is 360, while the sum is 21.

The square root of 12121653 is about 3481.6164349336. The cubic root of 12121653 is about 229.7139038830.

Adding to 12121653 its reverse (35612121), we get a palindrome (47733774).

The spelling of 12121653 in words is "twelve million, one hundred twenty-one thousand, six hundred fifty-three".