221830533 has 12 divisors (see below), whose sum is σ = 322084620. Its totient is φ = 147119616.

The previous prime is 221830487. The next prime is 221830547. The reversal of 221830533 is 335038122.

It can be written as a sum of positive squares in 2 ways, for example, as 69505569 + 152324964 = 8337^2 + 12342^2 .

It is not a de Polignac number, because 221830533 - 2¹⁶ = 221764997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221830497 and 221830506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221830733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62118 + ... + 65591.

It is an arithmetic number, because the mean of its divisors is an integer number (26840385).

Almost surely, 2^221830533 is an apocalyptic number.

It is an amenable number.

221830533 is a deficient number, since it is larger than the sum of its proper divisors (100254087).

221830533 is a wasteful number, since it uses less digits than its factorization.

221830533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127908 (or 127905 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 221830533 is about 14893.9763998739. The cubic root of 221830533 is about 605.3507817090.

Adding to 221830533 its reverse (335038122), we get a palindrome (556868655).

The spelling of 221830533 in words is "two hundred twenty-one million, eight hundred thirty thousand, five hundred thirty-three".