221641630 has 32 divisors (see below), whose sum is σ = 470661120. Its totient is φ = 73539360.

The previous prime is 221641621. The next prime is 221641633. The reversal of 221641630 is 36146122.

It is a junction number, because it is equal to n+sod(n) for n = 221641595 and 221641604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221641633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48900 + ... + 53239.

It is an arithmetic number, because the mean of its divisors is an integer number (14708160).

Almost surely, 2^221641630 is an apocalyptic number.

221641630 is an abundant number, since it is smaller than the sum of its proper divisors (249019490).

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

221641630 is a wasteful number, since it uses less digits than its factorization.

221641630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102184.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 221641630 is about 14887.6334586797. The cubic root of 221641630 is about 605.1789011716.

Adding to 221641630 its reverse (36146122), we get a palindrome (257787752).

The spelling of 221641630 in words is "two hundred twenty-one million, six hundred forty-one thousand, six hundred thirty".