221620244 has 12 divisors (see below), whose sum is σ = 388042368. Its totient is φ = 110751000.

The previous prime is 221620241. The next prime is 221620253. The reversal of 221620244 is 442026122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221620241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5732 + ... + 21819.

It is an arithmetic number, because the mean of its divisors is an integer number (32336864).

Almost surely, 2^221620244 is an apocalyptic number.

It is an amenable number.

221620244 is a deficient number, since it is larger than the sum of its proper divisors (166422124).

221620244 is a wasteful number, since it uses less digits than its factorization.

221620244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29566 (or 29564 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 221620244 is about 14886.9151942234. The cubic root of 221620244 is about 605.1594361577.

Adding to 221620244 its reverse (442026122), we get a palindrome (663646366).

The spelling of 221620244 in words is "two hundred twenty-one million, six hundred twenty thousand, two hundred forty-four".