1222521 has 8 divisors (see below), whose sum is σ = 1725984. Its totient is φ = 767040.

The previous prime is 1222513. The next prime is 1222523. The reversal of 1222521 is 1252221.

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

It is not a de Polignac number, because 1222521 - 2³ = 1222513 is a prime.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1222521.

It is not an unprimeable number, because it can be changed into a prime (1222523) 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, 11935 + ... + 12036.

It is an arithmetic number, because the mean of its divisors is an integer number (215748).

2^1222521 is an apocalyptic number.

It is an amenable number.

1222521 is a deficient number, since it is larger than the sum of its proper divisors (503463).

1222521 is a wasteful number, since it uses less digits than its factorization.

1222521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23991.

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

The square root of 1222521 is about 1105.6767158623. The cubic root of 1222521 is about 106.9265224717.

Adding to 1222521 its reverse (1252221), we get a palindrome (2474742).

It can be divided in two parts, 12225 and 21, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 1222521 in words is "one million, two hundred twenty-two thousand, five hundred twenty-one".