1219221 has 6 divisors (see below), whose sum is σ = 1761110. Its totient is φ = 812808.

The previous prime is 1219213. The next prime is 1219237. The reversal of 1219221 is 1229121.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 239121 = 990^2 + 489^2 .

It is not a de Polignac number, because 1219221 - 2³ = 1219213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1219194 and 1219203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67726 + ... + 67743.

2^1219221 is an apocalyptic number.

It is an amenable number.

1219221 is a deficient number, since it is larger than the sum of its proper divisors (541889).

1219221 is a wasteful number, since it uses less digits than its factorization.

1219221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135475 (or 135472 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1219221 is about 1104.1834086781. The cubic root of 1219221 is about 106.8302254223.

The spelling of 1219221 in words is "one million, two hundred nineteen thousand, two hundred twenty-one".