13212661 has 32 divisors (see below), whose sum is σ = 17498880. Its totient is φ = 9676800.

The previous prime is 13212643. The next prime is 13212677. The reversal of 13212661 is 16621231.

It is not a de Polignac number, because 13212661 - 2⁵ = 13212629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136165 + ... + 136261.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^13212661 is an apocalyptic number.

13212661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13212661 is a deficient number, since it is larger than the sum of its proper divisors (4286219).

13212661 is a wasteful number, since it uses less digits than its factorization.

13212661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205.

The product of its digits is 432, while the sum is 22.

The square root of 13212661 is about 3634.9224200800. The cubic root of 13212661 is about 236.4086869078.

Adding to 13212661 its reverse (16621231), we get a palindrome (29833892).

The spelling of 13212661 in words is "thirteen million, two hundred twelve thousand, six hundred sixty-one".