12216455 has 16 divisors (see below), whose sum is σ = 15686784. Its totient is φ = 9100800.

The previous prime is 12216439. The next prime is 12216493. The reversal of 12216455 is 55461221.

12216455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12216455 - 2⁴ = 12216439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7874 + ... + 9296.

It is an arithmetic number, because the mean of its divisors is an integer number (980424).

Almost surely, 2^12216455 is an apocalyptic number.

12216455 is a deficient number, since it is larger than the sum of its proper divisors (3470329).

12216455 is a wasteful number, since it uses less digits than its factorization.

12216455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546.

The product of its digits is 2400, while the sum is 26.

The square root of 12216455 is about 3495.2045719814. The cubic root of 12216455 is about 230.3112044398.

Adding to 12216455 its reverse (55461221), we get a palindrome (67677676).

The spelling of 12216455 in words is "twelve million, two hundred sixteen thousand, four hundred fifty-five".