220051 has 4 divisors (see below), whose sum is σ = 236992. Its totient is φ = 203112.

The previous prime is 220021. The next prime is 220057. The reversal of 220051 is 150022.

220051 = 189² + 190² + ... + 194².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150022 = 2 ⋅75011.

It is not a de Polignac number, because 220051 - 2⁵ = 220019 is a prime.

It is a Duffinian number.

220051 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (220057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8451 + ... + 8476.

It is an arithmetic number, because the mean of its divisors is an integer number (59248).

2²²⁰⁰⁵¹ is an apocalyptic number.

220051 is a deficient number, since it is larger than the sum of its proper divisors (16941).

220051 is a wasteful number, since it uses less digits than its factorization.

220051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16940.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 220051 is about 469.0959390146. The cubic root of 220051 is about 60.3727718159.

Adding to 220051 its reverse (150022), we get a palindrome (370073).

The spelling of 220051 in words is "two hundred twenty thousand, fifty-one".