221440438 has 4 divisors (see below), whose sum is σ = 332160660. Its totient is φ = 110720218.

The previous prime is 221440423. The next prime is 221440447. The reversal of 221440438 is 834044122.

It is a happy number.

It is a semiprime because it is the product of two primes.

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, 55360108 + ... + 55360111.

It is an arithmetic number, because the mean of its divisors is an integer number (83040165).

Almost surely, 2^221440438 is an apocalyptic number.

221440438 is a deficient number, since it is larger than the sum of its proper divisors (110720222).

221440438 is a wasteful number, since it uses less digits than its factorization.

221440438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110720221.

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 221440438 is about 14880.8749070745. The cubic root of 221440438 is about 604.9957315911.

The spelling of 221440438 in words is "two hundred twenty-one million, four hundred forty thousand, four hundred thirty-eight".