1221023 has 4 divisors (see below), whose sum is σ = 1224288. Its totient is φ = 1217760.

The previous prime is 1221019. The next prime is 1221029. The reversal of 1221023 is 3201221.

It is a happy number.

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 1221023 - 2² = 1221019 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1220995 and 1221013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 986 + ... + 1847.

It is an arithmetic number, because the mean of its divisors is an integer number (306072).

2^1221023 is an apocalyptic number.

1221023 is a deficient number, since it is larger than the sum of its proper divisors (3265).

1221023 is an equidigital number, since it uses as much as digits as its factorization.

1221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1221023 is about 1104.9990950223. Note that the first 3 decimals coincide. The cubic root of 1221023 is about 106.8828309527.

Adding to 1221023 its reverse (3201221), we get a palindrome (4422244).

The spelling of 1221023 in words is "one million, two hundred twenty-one thousand, twenty-three".