221061643 has 8 divisors (see below), whose sum is σ = 247676400. Its totient is φ = 195533280.

The previous prime is 221061611. The next prime is 221061683. The reversal of 221061643 is 346160122.

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

It is a cyclic number.

It is not a de Polignac number, because 221061643 - 2⁵ = 221061611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221061683) 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, 271168 + ... + 271981.

It is an arithmetic number, because the mean of its divisors is an integer number (30959550).

Almost surely, 2^221061643 is an apocalyptic number.

221061643 is a deficient number, since it is larger than the sum of its proper divisors (26614757).

221061643 is a wasteful number, since it uses less digits than its factorization.

221061643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543197.

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

The square root of 221061643 is about 14868.1418812170. The cubic root of 221061643 is about 604.6505670606.

The spelling of 221061643 in words is "two hundred twenty-one million, sixty-one thousand, six hundred forty-three".