221241501 has 12 divisors (see below), whose sum is σ = 344153628. Its totient is φ = 136148544.

The previous prime is 221241499. The next prime is 221241509. The reversal of 221241501 is 105142122.

It can be written as a sum of positive squares in 2 ways, for example, as 33524100 + 187717401 = 5790^2 + 13701^2 .

It is not a de Polignac number, because 221241501 - 2¹ = 221241499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221241509) 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, 945360 + ... + 945593.

It is an arithmetic number, because the mean of its divisors is an integer number (28679469).

Almost surely, 2^221241501 is an apocalyptic number.

It is an amenable number.

221241501 is a deficient number, since it is larger than the sum of its proper divisors (122912127).

221241501 is a wasteful number, since it uses less digits than its factorization.

221241501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890972 (or 1890969 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221241501 is about 14874.1890871402. The cubic root of 221241501 is about 604.8145058905.

Adding to 221241501 its reverse (105142122), we get a palindrome (326383623).

The spelling of 221241501 in words is "two hundred twenty-one million, two hundred forty-one thousand, five hundred one".