221422521 has 8 divisors (see below), whose sum is σ = 295643520. Its totient is φ = 147408272.

The previous prime is 221422519. The next prime is 221422529. The reversal of 221422521 is 125224122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221422521 - 2¹ = 221422519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221422529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49170 + ... + 53483.

It is an arithmetic number, because the mean of its divisors is an integer number (36955440).

Almost surely, 2^221422521 is an apocalyptic number.

It is an amenable number.

221422521 is a deficient number, since it is larger than the sum of its proper divisors (74220999).

221422521 is a wasteful number, since it uses less digits than its factorization.

221422521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103375.

The product of its digits is 640, while the sum is 21.

The square root of 221422521 is about 14880.2728805624. The cubic root of 221422521 is about 604.9794141847.

Adding to 221422521 its reverse (125224122), we get a palindrome (346646643).

The spelling of 221422521 in words is "two hundred twenty-one million, four hundred twenty-two thousand, five hundred twenty-one".