221002205 has 16 divisors (see below), whose sum is σ = 279702720. Its totient is φ = 167171328.

The previous prime is 221002183. The next prime is 221002211. The reversal of 221002205 is 502200122.

221002205 = 1941² + 1942² + ... + 1997².

It is a cyclic number.

It is not a de Polignac number, because 221002205 - 2¹² = 220998109 is a prime.

It is a super-2 number, since 2×221002205² = 97683949229724050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221002205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54374 + ... + 58296.

It is an arithmetic number, because the mean of its divisors is an integer number (17481420).

Almost surely, 2^221002205 is an apocalyptic number.

It is an amenable number.

221002205 is a deficient number, since it is larger than the sum of its proper divisors (58700515).

221002205 is a wasteful number, since it uses less digits than its factorization.

221002205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 221002205 is about 14866.1429093091. The cubic root of 221002205 is about 604.5963703496.

Adding to 221002205 its reverse (502200122), we get a palindrome (723202327).

The spelling of 221002205 in words is "two hundred twenty-one million, two thousand, two hundred five".