1221473 has 4 divisors (see below), whose sum is σ = 1332528. Its totient is φ = 1110420.

The previous prime is 1221469. The next prime is 1221499. The reversal of 1221473 is 3741221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3741221 = 11 ⋅340111.

It is a cyclic number.

It is not a de Polignac number, because 1221473 - 2² = 1221469 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55511 + ... + 55532.

It is an arithmetic number, because the mean of its divisors is an integer number (333132).

2^1221473 is an apocalyptic number.

It is an amenable number.

1221473 is a deficient number, since it is larger than the sum of its proper divisors (111055).

1221473 is a wasteful number, since it uses less digits than its factorization.

1221473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111054.

The product of its digits is 336, while the sum is 20.

The square root of 1221473 is about 1105.2026963413. The cubic root of 1221473 is about 106.8959596616.

Adding to 1221473 its reverse (3741221), we get a palindrome (4962694).

The spelling of 1221473 in words is "one million, two hundred twenty-one thousand, four hundred seventy-three".