221146626 has 16 divisors (see below), whose sum is σ = 442547424. Its totient is φ = 73673184.

The previous prime is 221146619. The next prime is 221146649. The reversal of 221146626 is 626641122.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221146593 and 221146602.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1845 + ... + 21111.

It is an arithmetic number, because the mean of its divisors is an integer number (27659214).

Almost surely, 2^221146626 is an apocalyptic number.

221146626 is an abundant number, since it is smaller than the sum of its proper divisors (221400798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221146626 is a wasteful number, since it uses less digits than its factorization.

221146626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21185.

The product of its digits is 6912, while the sum is 30.

The square root of 221146626 is about 14870.9994956627. Note that the first 3 decimals coincide. The cubic root of 221146626 is about 604.7280393215.

Adding to 221146626 its reverse (626641122), we get a palindrome (847787748).

The spelling of 221146626 in words is "two hundred twenty-one million, one hundred forty-six thousand, six hundred twenty-six".