1221053 has 4 divisors (see below), whose sum is σ = 1224000. Its totient is φ = 1218108.

The previous prime is 1221049. The next prime is 1221061. The reversal of 1221053 is 3501221.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1221053 - 2² = 1221049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221083) 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, 725 + ... + 1722.

It is an arithmetic number, because the mean of its divisors is an integer number (306000).

2^1221053 is an apocalyptic number.

It is an amenable number.

1221053 is a deficient number, since it is larger than the sum of its proper divisors (2947).

1221053 is an equidigital number, since it uses as much as digits as its factorization.

1221053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1221053 is about 1105.0126696106. The cubic root of 1221053 is about 106.8837063003.

Adding to 1221053 its reverse (3501221), we get a palindrome (4722274).

The spelling of 1221053 in words is "one million, two hundred twenty-one thousand, fifty-three".