221146646 has 8 divisors (see below), whose sum is σ = 379108560. Its totient is φ = 94777128.

The previous prime is 221146619. The next prime is 221146649. The reversal of 221146646 is 646641122.

221146646 = 7434² + 7435² + ... + 7437².

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221146649) 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, 7898081 + ... + 7898108.

It is an arithmetic number, because the mean of its divisors is an integer number (47388570).

Almost surely, 2^221146646 is an apocalyptic number.

221146646 is a deficient number, since it is larger than the sum of its proper divisors (157961914).

221146646 is a wasteful number, since it uses less digits than its factorization.

221146646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15796198.

The product of its digits is 13824, while the sum is 32.

The square root of 221146646 is about 14871.0001681124. Note that the first 3 decimals coincide. The cubic root of 221146646 is about 604.7280575516.

Adding to 221146646 its reverse (646641122), we get a palindrome (867787768).

The spelling of 221146646 in words is "two hundred twenty-one million, one hundred forty-six thousand, six hundred forty-six".