1221043 has 4 divisors (see below), whose sum is σ = 1223640. Its totient is φ = 1218448.

The previous prime is 1221029. The next prime is 1221049. The reversal of 1221043 is 3401221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221043 - 2¹³ = 1212851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221049) 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, 373 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (305910).

2^1221043 is an apocalyptic number.

1221043 is a deficient number, since it is larger than the sum of its proper divisors (2597).

1221043 is an equidigital number, since it uses as much as digits as its factorization.

1221043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1221043 is about 1105.0081447664. The cubic root of 1221043 is about 106.8834145194.

Adding to 1221043 its reverse (3401221), we get a palindrome (4622264).

The spelling of 1221043 in words is "one million, two hundred twenty-one thousand, forty-three".