12210657 has 4 divisors (see below), whose sum is σ = 16280880. Its totient is φ = 8140436.

The previous prime is 12210619. The next prime is 12210659. The reversal of 12210657 is 75601221.

12210657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75601221 = 3 ⋅25200407.

It is a cyclic number.

It is not a de Polignac number, because 12210657 - 2²² = 8016353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12210659) 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, 2035107 + ... + 2035112.

It is an arithmetic number, because the mean of its divisors is an integer number (4070220).

Almost surely, 2^12210657 is an apocalyptic number.

It is an amenable number.

12210657 is a deficient number, since it is larger than the sum of its proper divisors (4070223).

12210657 is an equidigital number, since it uses as much as digits as its factorization.

12210657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4070222.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 12210657 is about 3494.3750514219. The cubic root of 12210657 is about 230.2747629988.

Adding to 12210657 its reverse (75601221), we get a palindrome (87811878).

The spelling of 12210657 in words is "twelve million, two hundred ten thousand, six hundred fifty-seven".