221340501 has 12 divisors (see below), whose sum is σ = 320139820. Its totient is φ = 147363840.

The previous prime is 221340491. The next prime is 221340547. The reversal of 221340501 is 105043122.

221340501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 43758225 + 177582276 = 6615^2 + 13326^2 .

It is not a de Polignac number, because 221340501 - 2¹⁵ = 221307733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221340551) 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, 9070 + ... + 22911.

Almost surely, 2^221340501 is an apocalyptic number.

It is an amenable number.

221340501 is a deficient number, since it is larger than the sum of its proper divisors (98799319).

221340501 is a wasteful number, since it uses less digits than its factorization.

221340501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32756 (or 32753 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 221340501 is about 14877.5166274483. The cubic root of 221340501 is about 604.9047055245.

Adding to 221340501 its reverse (105043122), we get a palindrome (326383623).

It can be divided in two parts, 221340 and 501, that added together give a square (221841 = 471²).

The spelling of 221340501 in words is "two hundred twenty-one million, three hundred forty thousand, five hundred one".