1522221 has 8 divisors (see below), whose sum is σ = 2050944. Its totient is φ = 1004160.

The previous prime is 1522201. The next prime is 1522249. The reversal of 1522221 is 1222251.

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

It is not a de Polignac number, because 1522221 - 2¹¹ = 1520173 is a prime.

1522221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1522221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1522201) 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, 2325 + ... + 2906.

It is an arithmetic number, because the mean of its divisors is an integer number (256368).

2^1522221 is an apocalyptic number.

It is an amenable number.

1522221 is a deficient number, since it is larger than the sum of its proper divisors (528723).

1522221 is an equidigital number, since it uses as much as digits as its factorization.

1522221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5331.

The product of its digits is 80, while the sum is 15.

The square root of 1522221 is about 1233.7832062401. The cubic root of 1522221 is about 115.0339156425.

Adding to 1522221 its reverse (1222251), we get a palindrome (2744472).

The spelling of 1522221 in words is "one million, five hundred twenty-two thousand, two hundred twenty-one".