12221756 has 6 divisors (see below), whose sum is σ = 21388080. Its totient is φ = 6110876.

The previous prime is 12221749. The next prime is 12221771. The reversal of 12221756 is 65712221.

It is a super-3 number, since 3×12221756³ (a number of 22 digits) contains 333 as substring.

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, 1527716 + ... + 1527723.

It is an arithmetic number, because the mean of its divisors is an integer number (3564680).

Almost surely, 2^12221756 is an apocalyptic number.

It is an amenable number.

12221756 is a deficient number, since it is larger than the sum of its proper divisors (9166324).

12221756 is a wasteful number, since it uses less digits than its factorization.

12221756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3055443 (or 3055441 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 12221756 is about 3495.9628144475. The cubic root of 12221756 is about 230.3445120605.

Adding to 12221756 its reverse (65712221), we get a palindrome (77933977).

The spelling of 12221756 in words is "twelve million, two hundred twenty-one thousand, seven hundred fifty-six".