221412186 has 12 divisors (see below), whose sum is σ = 479726442. Its totient is φ = 73804056.

The previous prime is 221412161. The next prime is 221412197. The reversal of 221412186 is 681214122.

221412186 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 204347025 + 17065161 = 14295^2 + 4131^2 .

It is a super-2 number, since 2×221412186² = 98046712218597192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6150321 + ... + 6150356.

Almost surely, 2^221412186 is an apocalyptic number.

221412186 is an abundant number, since it is smaller than the sum of its proper divisors (258314256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221412186 is a wasteful number, since it uses less digits than its factorization.

221412186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12300685 (or 12300682 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 221412186 is about 14879.9256046527. The cubic root of 221412186 is about 604.9700014723.

It can be divided in two parts, 2214 and 12186, that added together give a square (14400 = 120²).

The spelling of 221412186 in words is "two hundred twenty-one million, four hundred twelve thousand, one hundred eighty-six".