221466831 has 16 divisors (see below), whose sum is σ = 311274240. Its totient is φ = 139674240.

The previous prime is 221466829. The next prime is 221466859. The reversal of 221466831 is 138664122.

It is not a de Polignac number, because 221466831 - 2¹ = 221466829 is a prime.

It is a super-2 number, since 2×221466831² = 98095114466365122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221466792 and 221466801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221466331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44551 + ... + 49271.

It is an arithmetic number, because the mean of its divisors is an integer number (19454640).

Almost surely, 2^221466831 is an apocalyptic number.

221466831 is a deficient number, since it is larger than the sum of its proper divisors (89807409).

221466831 is a wasteful number, since it uses less digits than its factorization.

221466831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5566.

The product of its digits is 13824, while the sum is 33.

The square root of 221466831 is about 14881.7616900688. The cubic root of 221466831 is about 605.0197666743.

The spelling of 221466831 in words is "two hundred twenty-one million, four hundred sixty-six thousand, eight hundred thirty-one".