221006410 has 8 divisors (see below), whose sum is σ = 397811556. Its totient is φ = 88402560.

The previous prime is 221006393. The next prime is 221006413. The reversal of 221006410 is 14600122.

It can be written as a sum of positive squares in 2 ways, for example, as 196196049 + 24810361 = 14007^2 + 4981^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×221006410² = 97687666522176200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221006413) 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, 11050311 + ... + 11050330.

Almost surely, 2^221006410 is an apocalyptic number.

221006410 is a deficient number, since it is larger than the sum of its proper divisors (176805146).

221006410 is a wasteful number, since it uses less digits than its factorization.

221006410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22100648.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221006410 is about 14866.2843373857. The cubic root of 221006410 is about 604.6002048688.

Adding to 221006410 its reverse (14600122), we get a palindrome (235606532).

The spelling of 221006410 in words is "two hundred twenty-one million, six thousand, four hundred ten".