23212216 has 8 divisors (see below), whose sum is σ = 43522920. Its totient is φ = 11606104.

The previous prime is 23212207. The next prime is 23212247. The reversal of 23212216 is 61221232.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 23212193 and 23212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1450756 + ... + 1450771.

It is an arithmetic number, because the mean of its divisors is an integer number (5440365).

Almost surely, 2^23212216 is an apocalyptic number.

It is an amenable number.

23212216 is a deficient number, since it is larger than the sum of its proper divisors (20310704).

23212216 is a wasteful number, since it uses less digits than its factorization.

23212216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901533 (or 2901529 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 23212216 is about 4817.9057691076. The cubic root of 23212216 is about 285.2586796767.

Adding to 23212216 its reverse (61221232), we get a palindrome (84433448).

The spelling of 23212216 in words is "twenty-three million, two hundred twelve thousand, two hundred sixteen".