1221153 has 8 divisors (see below), whose sum is σ = 1636128. Its totient is φ = 810144.

The previous prime is 1221131. The next prime is 1221163. The reversal of 1221153 is 3511221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221153 - 2⁶ = 1221089 is a prime.

1221153 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1221113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175 + ... + 1572.

It is an arithmetic number, because the mean of its divisors is an integer number (204516).

2^1221153 is an apocalyptic number.

It is an amenable number.

1221153 is a deficient number, since it is larger than the sum of its proper divisors (414975).

1221153 is a wasteful number, since it uses less digits than its factorization.

1221153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983.

The product of its digits is 60, while the sum is 15.

The square root of 1221153 is about 1105.0579170342. The cubic root of 1221153 is about 106.8866240221.

Adding to 1221153 its reverse (3511221), we get a palindrome (4732374).

It can be divided in two parts, 122 and 1153, that added together give a triangular number (1275 = T₅₀).

The spelling of 1221153 in words is "one million, two hundred twenty-one thousand, one hundred fifty-three".