12213555 has 8 divisors (see below), whose sum is σ = 19541712. Its totient is φ = 6513888.

The previous prime is 12213541. The next prime is 12213571. The reversal of 12213555 is 55531221.

It is a happy number.

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

It is not a de Polignac number, because 12213555 - 2¹² = 12209459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407104 + ... + 407133.

It is an arithmetic number, because the mean of its divisors is an integer number (2442714).

Almost surely, 2^12213555 is an apocalyptic number.

12213555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12213555 is a deficient number, since it is larger than the sum of its proper divisors (7328157).

12213555 is an equidigital number, since it uses as much as digits as its factorization.

12213555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814245.

The product of its digits is 1500, while the sum is 24.

The square root of 12213555 is about 3494.7896932434. The cubic root of 12213555 is about 230.2929788758.

Adding to 12213555 its reverse (55531221), we get a palindrome (67744776).

The spelling of 12213555 in words is "twelve million, two hundred thirteen thousand, five hundred fifty-five".