1321606221 has 8 divisors (see below), whose sum is σ = 1897691040. Its totient is φ = 813296112.

The previous prime is 1321606213. The next prime is 1321606249. The reversal of 1321606221 is 1226061231.

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

It is not a de Polignac number, because 1321606221 - 2³ = 1321606213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321606191 and 1321606200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321606211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16943631 + ... + 16943708.

It is an arithmetic number, because the mean of its divisors is an integer number (237211380).

Almost surely, 2^1321606221 is an apocalyptic number.

It is an amenable number.

1321606221 is a deficient number, since it is larger than the sum of its proper divisors (576084819).

1321606221 is a wasteful number, since it uses less digits than its factorization.

1321606221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33887355.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1321606221 is about 36353.9024177598. The cubic root of 1321606221 is about 1097.4060701087.

Adding to 1321606221 its reverse (1226061231), we get a palindrome (2547667452).

The spelling of 1321606221 in words is "one billion, three hundred twenty-one million, six hundred six thousand, two hundred twenty-one".