1221322201 has 8 divisors (see below), whose sum is σ = 1332607104. Its totient is φ = 1110079920.

The previous prime is 1221322127. The next prime is 1221322231. The reversal of 1221322201 is 1022231221.

It is a happy number.

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 1221322201 - 2⁷ = 1221322073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221322231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94035 + ... + 106231.

It is an arithmetic number, because the mean of its divisors is an integer number (166575888).

Almost surely, 2^1221322201 is an apocalyptic number.

1221322201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221322201 is a deficient number, since it is larger than the sum of its proper divisors (111284903).

1221322201 is a wasteful number, since it uses less digits than its factorization.

1221322201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21311.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221322201 is about 34947.4205199754. The cubic root of 1221322201 is about 1068.9156047382.

Adding to 1221322201 its reverse (1022231221), we get a palindrome (2243553422).

The spelling of 1221322201 in words is "one billion, two hundred twenty-one million, three hundred twenty-two thousand, two hundred one".