1220023355 has 4 divisors (see below), whose sum is σ = 1464028032. Its totient is φ = 976018680.

The previous prime is 1220023351. The next prime is 1220023369. The reversal of 1220023355 is 5533200221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5533200221 = 89 ⋅62170789.

It is not a de Polignac number, because 1220023355 - 2² = 1220023351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220023355.

It is not an unprimeable number, because it can be changed into a prime (1220023351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122002331 + ... + 122002340.

It is an arithmetic number, because the mean of its divisors is an integer number (366007008).

Almost surely, 2^1220023355 is an apocalyptic number.

1220023355 is a deficient number, since it is larger than the sum of its proper divisors (244004677).

1220023355 is an equidigital number, since it uses as much as digits as its factorization.

1220023355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244004676.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 1220023355 is about 34928.8327173984. The cubic root of 1220023355 is about 1068.5365485512.

Adding to 1220023355 its reverse (5533200221), we get a palindrome (6753223576).

The spelling of 1220023355 in words is "one billion, two hundred twenty million, twenty-three thousand, three hundred fifty-five".