221206423 has 8 divisors (see below), whose sum is σ = 222374160. Its totient is φ = 220042560.

The previous prime is 221206409. The next prime is 221206457. The reversal of 221206423 is 324602122.

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 221206423 - 2¹³ = 221198231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221206394 and 221206403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221206123) 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, 227328 + ... + 228298.

It is an arithmetic number, because the mean of its divisors is an integer number (27796770).

Almost surely, 2^221206423 is an apocalyptic number.

221206423 is a deficient number, since it is larger than the sum of its proper divisors (1167737).

221206423 is an equidigital number, since it uses as much as digits as its factorization.

221206423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 221206423 is about 14873.0098836786. The cubic root of 221206423 is about 604.7825396086.

Adding to 221206423 its reverse (324602122), we get a palindrome (545808545).

The spelling of 221206423 in words is "two hundred twenty-one million, two hundred six thousand, four hundred twenty-three".