221550641 has 8 divisors (see below), whose sum is σ = 239844864. Its totient is φ = 203435280.

The previous prime is 221550629. The next prime is 221550643. The reversal of 221550641 is 146055122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221550641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221550641.

It is not an unprimeable number, because it can be changed into a prime (221550643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42131 + ... + 47096.

It is an arithmetic number, because the mean of its divisors is an integer number (29980608).

Almost surely, 2^221550641 is an apocalyptic number.

It is an amenable number.

221550641 is a deficient number, since it is larger than the sum of its proper divisors (18294223).

221550641 is a wasteful number, since it uses less digits than its factorization.

221550641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89431.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 221550641 is about 14884.5772865742. The cubic root of 221550641 is about 605.0960765388.

The spelling of 221550641 in words is "two hundred twenty-one million, five hundred fifty thousand, six hundred forty-one".