221202028 has 36 divisors (see below), whose sum is σ = 432630072. Its totient is φ = 98605440.

The previous prime is 221202013. The next prime is 221202029. The reversal of 221202028 is 820202122.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 221201996 and 221202014.

It is not an unprimeable number, because it can be changed into a prime (221202029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20043 + ... + 29053.

It is an arithmetic number, because the mean of its divisors is an integer number (12017502).

Almost surely, 2^221202028 is an apocalyptic number.

It is an amenable number.

221202028 is a deficient number, since it is larger than the sum of its proper divisors (211428044).

221202028 is a wasteful number, since it uses less digits than its factorization.

221202028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9070 (or 9049 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 221202028 is about 14872.8621320847. The cubic root of 221202028 is about 604.7785342444.

The spelling of 221202028 in words is "two hundred twenty-one million, two hundred two thousand, twenty-eight".