221346601 has 4 divisors (see below), whose sum is σ = 252967552. Its totient is φ = 189725652.

The previous prime is 221346571. The next prime is 221346611. The reversal of 221346601 is 106643122.

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: 106643122 = 2 ⋅53321561.

It is a cyclic number.

It is not a de Polignac number, because 221346601 - 2¹⁷ = 221215529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221346611) 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, 15810465 + ... + 15810478.

It is an arithmetic number, because the mean of its divisors is an integer number (63241888).

Almost surely, 2^221346601 is an apocalyptic number.

It is an amenable number.

221346601 is a deficient number, since it is larger than the sum of its proper divisors (31620951).

221346601 is an equidigital number, since it uses as much as digits as its factorization.

221346601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31620950.

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

The square root of 221346601 is about 14877.7216333685. The cubic root of 221346601 is about 604.9102623999.

Adding to 221346601 its reverse (106643122), we get a palindrome (327989723).

The spelling of 221346601 in words is "two hundred twenty-one million, three hundred forty-six thousand, six hundred one".