1221010321 has 8 divisors (see below), whose sum is σ = 1247633280. Its totient is φ = 1194414288.

The previous prime is 1221010309. The next prime is 1221010339. The reversal of 1221010321 is 1230101221.

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 1221010321 - 2¹¹ = 1221008273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221017321) 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 7 ways as a sum of consecutive naturals, for example, 104775 + ... + 115843.

It is an arithmetic number, because the mean of its divisors is an integer number (155954160).

Almost surely, 2^1221010321 is an apocalyptic number.

It is an amenable number.

1221010321 is a deficient number, since it is larger than the sum of its proper divisors (26622959).

1221010321 is a wasteful number, since it uses less digits than its factorization.

1221010321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13463.

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

The square root of 1221010321 is about 34942.9581031715. The cubic root of 1221010321 is about 1068.8246099732.

Adding to 1221010321 its reverse (1230101221), we get a palindrome (2451111542).

The spelling of 1221010321 in words is "one billion, two hundred twenty-one million, ten thousand, three hundred twenty-one".