221001602 has 4 divisors (see below), whose sum is σ = 331502406. Its totient is φ = 110500800.

The previous prime is 221001593. The next prime is 221001607. The reversal of 221001602 is 206100122.

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

It can be written as a sum of positive squares in only one way, i.e., 203604361 + 17397241 = 14269^2 + 4171^2 .

It is not an unprimeable number, because it can be changed into a prime (221001607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55250399 + ... + 55250402.

Almost surely, 2^221001602 is an apocalyptic number.

221001602 is a deficient number, since it is larger than the sum of its proper divisors (110500804).

221001602 is a wasteful number, since it uses less digits than its factorization.

221001602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110500803.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221001602 is about 14866.1226283117. The cubic root of 221001602 is about 604.5958204728.

Adding to 221001602 its reverse (206100122), we get a palindrome (427101724).

The spelling of 221001602 in words is "two hundred twenty-one million, one thousand, six hundred two".