1320100221 has 32 divisors (see below), whose sum is σ = 2040929280. Its totient is φ = 750556800.

The previous prime is 1320100163. The next prime is 1320100253. The reversal of 1320100221 is 1220010231.

It is not a de Polignac number, because 1320100221 - 2²² = 1315905917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320100197 and 1320100206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320100021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54361 + ... + 74801.

It is an arithmetic number, because the mean of its divisors is an integer number (63779040).

Almost surely, 2^1320100221 is an apocalyptic number.

1320100221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1320100221 is a deficient number, since it is larger than the sum of its proper divisors (720829059).

1320100221 is a wasteful number, since it uses less digits than its factorization.

1320100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20577.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1320100221 is about 36333.1834691099. The cubic root of 1320100221 is about 1096.9890720464.

Adding to 1320100221 its reverse (1220010231), we get a palindrome (2540110452).

The spelling of 1320100221 in words is "one billion, three hundred twenty million, one hundred thousand, two hundred twenty-one".