221650801 has 4 divisors (see below), whose sum is σ = 222165504. Its totient is φ = 221136100.

The previous prime is 221650771. The next prime is 221650813. The reversal of 221650801 is 108056122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 108056122 = 2 ⋅54028061.

It is a cyclic number.

It is not a de Polignac number, because 221650801 - 2⁵ = 221650769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221650841) 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, 256705 + ... + 257566.

It is an arithmetic number, because the mean of its divisors is an integer number (55541376).

Almost surely, 2^221650801 is an apocalyptic number.

It is an amenable number.

221650801 is a deficient number, since it is larger than the sum of its proper divisors (514703).

221650801 is an equidigital number, since it uses as much as digits as its factorization.

221650801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514702.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 221650801 is about 14887.9414628081. The cubic root of 221650801 is about 605.1872480079.

The spelling of 221650801 in words is "two hundred twenty-one million, six hundred fifty thousand, eight hundred one".