221445414 has 28 divisors (see below), whose sum is σ = 498027636. Its totient is φ = 73814652.

The previous prime is 221445391. The next prime is 221445457. The reversal of 221445414 is 414544122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 74484 + ... + 77399.

Almost surely, 2^221445414 is an apocalyptic number.

221445414 is an abundant number, since it is smaller than the sum of its proper divisors (276582222).

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

221445414 is an equidigital number, since it uses as much as digits as its factorization.

221445414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151903 (or 151888 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 221445414 is about 14881.0421006057. The cubic root of 221445414 is about 605.0002631877. Note that the first 3 decimals are identical.

Adding to 221445414 its reverse (414544122), we get a palindrome (635989536).

The spelling of 221445414 in words is "two hundred twenty-one million, four hundred forty-five thousand, four hundred fourteen".