221342650 has 12 divisors (see below), whose sum is σ = 411697422. Its totient is φ = 88537040.

The previous prime is 221342591. The next prime is 221342659. The reversal of 221342650 is 56243122.

It can be written as a sum of positive squares in 3 ways, for example, as 187388721 + 33953929 = 13689^2 + 5827^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (221342659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2213377 + ... + 2213476.

Almost surely, 2^221342650 is an apocalyptic number.

221342650 is a deficient number, since it is larger than the sum of its proper divisors (190354772).

221342650 is a wasteful number, since it uses less digits than its factorization.

221342650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426865 (or 4426860 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 221342650 is about 14877.5888503480. The cubic root of 221342650 is about 604.9066631960.

Adding to 221342650 its reverse (56243122), we get a palindrome (277585772).

The spelling of 221342650 in words is "two hundred twenty-one million, three hundred forty-two thousand, six hundred fifty".