1321220101 has 8 divisors (see below), whose sum is σ = 1349949600. Its totient is φ = 1292755728.

The previous prime is 1321220083. The next prime is 1321220111. The reversal of 1321220101 is 1010221231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321220101 - 2⁷ = 1321219973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321220111) 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 7 ways as a sum of consecutive naturals, for example, 56191 + ... + 76156.

It is an arithmetic number, because the mean of its divisors is an integer number (168743700).

Almost surely, 2^1321220101 is an apocalyptic number.

It is an amenable number.

1321220101 is a deficient number, since it is larger than the sum of its proper divisors (28729499).

1321220101 is a wasteful number, since it uses less digits than its factorization.

1321220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132563.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1321220101 is about 36348.5914582670. The cubic root of 1321220101 is about 1097.2991871110.

Adding to 1321220101 its reverse (1010221231), we get a palindrome (2331441332).

The spelling of 1321220101 in words is "one billion, three hundred twenty-one million, two hundred twenty thousand, one hundred one".