1220321523 has 16 divisors (see below), whose sum is σ = 1723831200. Its totient is φ = 765236736.

The previous prime is 1220321503. The next prime is 1220321533. The reversal of 1220321523 is 3251230221.

It is not a de Polignac number, because 1220321523 - 2²⁰ = 1219272947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220321523.

It is not an unprimeable number, because it can be changed into a prime (1220321503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93261 + ... + 105537.

It is an arithmetic number, because the mean of its divisors is an integer number (107739450).

Almost surely, 2^1220321523 is an apocalyptic number.

1220321523 is a deficient number, since it is larger than the sum of its proper divisors (503509677).

1220321523 is a wasteful number, since it uses less digits than its factorization.

1220321523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14246.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1220321523 is about 34933.1006782965. The cubic root of 1220321523 is about 1068.6235899052.

Adding to 1220321523 its reverse (3251230221), we get a palindrome (4471551744).

The spelling of 1220321523 in words is "one billion, two hundred twenty million, three hundred twenty-one thousand, five hundred twenty-three".