1221415 has 32 divisors (see below), whose sum is σ = 1774080. Its totient is φ = 798336.

The previous prime is 1221391. The next prime is 1221421. The reversal of 1221415 is 5141221.

It is a cyclic number.

It is not a de Polignac number, because 1221415 - 2⁵ = 1221383 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28384 + ... + 28426.

It is an arithmetic number, because the mean of its divisors is an integer number (55440).

2^1221415 is an apocalyptic number.

1221415 is a deficient number, since it is larger than the sum of its proper divisors (552665).

1221415 is a wasteful number, since it uses less digits than its factorization.

1221415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103.

The product of its digits is 80, while the sum is 16.

The square root of 1221415 is about 1105.1764564991. The cubic root of 1221415 is about 106.8942676979.

Adding to 1221415 its reverse (5141221), we get a palindrome (6362636).

The spelling of 1221415 in words is "one million, two hundred twenty-one thousand, four hundred fifteen".