221444442 has 24 divisors (see below), whose sum is σ = 497567616. Its totient is φ = 73814652.

The previous prime is 221444423. The next prime is 221444459. The reversal of 221444442 is 244444122.

221444442 is a `hidden beast` number, since 2 + 214 + 4 + 4 + 442 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227338 + ... + 228309.

It is an arithmetic number, because the mean of its divisors is an integer number (20731984).

Almost surely, 2^221444442 is an apocalyptic number.

221444442 is an abundant number, since it is smaller than the sum of its proper divisors (276123174).

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

221444442 is an equidigital number, since it uses as much as digits as its factorization.

221444442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455664 (or 455652 counting only the distinct ones).

The product of its digits is 8192, while the sum is 27.

The square root of 221444442 is about 14881.0094415668. The cubic root of 221444442 is about 604.9993780018. Note that the first 3 decimals are identical.

Adding to 221444442 its reverse (244444122), we get a palindrome (465888564).

It can be divided in two parts, 2214 and 44442, that added together give a 6-th power (46656 = 6⁶).

The spelling of 221444442 in words is "two hundred twenty-one million, four hundred forty-four thousand, four hundred forty-two".