12216031 has 8 divisors (see below), whose sum is σ = 13207280. Its totient is φ = 11259648.

The previous prime is 12215971. The next prime is 12216037. The reversal of 12216031 is 13061221.

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

It is a cyclic number.

It is not a de Polignac number, because 12216031 - 2²¹ = 10118879 is a prime.

It is a super-2 number, since 2×12216031² = 298462826785922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12215996 and 12216014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7986 + ... + 9391.

It is an arithmetic number, because the mean of its divisors is an integer number (1650910).

Almost surely, 2^12216031 is an apocalyptic number.

12216031 is a deficient number, since it is larger than the sum of its proper divisors (991249).

12216031 is a wasteful number, since it uses less digits than its factorization.

12216031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17433.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 12216031 is about 3495.1439169224. The cubic root of 12216031 is about 230.3085399167.

Adding to 12216031 its reverse (13061221), we get a palindrome (25277252).

The spelling of 12216031 in words is "twelve million, two hundred sixteen thousand, thirty-one".