221412042 has 40 divisors (see below), whose sum is σ = 513245700. Its totient is φ = 71257536.

The previous prime is 221412011. The next prime is 221412047. The reversal of 221412042 is 240214122.

It can be written as a sum of positive squares in 2 ways, for example, as 192349161 + 29062881 = 13869^2 + 5391^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221412047) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18867 + ... + 28262.

Almost surely, 2^221412042 is an apocalyptic number.

221412042 is an abundant number, since it is smaller than the sum of its proper divisors (291833658).

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

221412042 is a wasteful number, since it uses less digits than its factorization.

221412042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47172 (or 47163 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 221412042 is about 14879.9207659181. The cubic root of 221412042 is about 604.9698703207.

Adding to 221412042 its reverse (240214122), we get a palindrome (461626164).

The spelling of 221412042 in words is "two hundred twenty-one million, four hundred twelve thousand, forty-two".