221051 has 4 divisors (see below), whose sum is σ = 234072. Its totient is φ = 208032.
The previous prime is 221047. The next prime is 221059. The reversal of 221051 is 150122.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 221051 - 22 = 221047 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (221059) 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, 6485 + ... + 6518.
It is an arithmetic number, because the mean of its divisors is an integer number (58518).
2221051 is an apocalyptic number.
221051 is a deficient number, since it is larger than the sum of its proper divisors (13021).
221051 is a wasteful number, since it uses less digits than its factorization.
221051 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 13020.
The product of its (nonzero) digits is 20, while the sum is 11.
The square root of 221051 is about 470.1606108555. The cubic root of 221051 is about 60.4640863283.
Adding to 221051 its reverse (150122), we get a palindrome (371173).
The spelling of 221051 in words is "two hundred twenty-one thousand, fifty-one".
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