12210551 has 4 divisors (see below), whose sum is σ = 12236112. Its totient is φ = 12184992.

The previous prime is 12210503. The next prime is 12210563. The reversal of 12210551 is 15501221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15501221 = 179 ⋅86599.

It is a cyclic number.

It is not a de Polignac number, because 12210551 - 2⁶ = 12210487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12219551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12050 + ... + 13023.

It is an arithmetic number, because the mean of its divisors is an integer number (3059028).

Almost surely, 2^12210551 is an apocalyptic number.

12210551 is a deficient number, since it is larger than the sum of its proper divisors (25561).

12210551 is an equidigital number, since it uses as much as digits as its factorization.

12210551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25560.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12210551 is about 3494.3598841562. The cubic root of 12210551 is about 230.2740966630.

Adding to 12210551 its reverse (15501221), we get a palindrome (27711772).

The spelling of 12210551 in words is "twelve million, two hundred ten thousand, five hundred fifty-one".