1221203000321 has 8 divisors (see below), whose sum is σ = 1222028780544. Its totient is φ = 1220377504320.

The previous prime is 1221203000293. The next prime is 1221203000383. The reversal of 1221203000321 is 1230003021221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221203000321 is a prime.

It is a super-2 number, since 2×1221203000321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221203000321.

It is not an unprimeable number, because it can be changed into a prime (1221203000021) 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, 8904056 + ... + 9040166.

It is an arithmetic number, because the mean of its divisors is an integer number (152753597568).

Almost surely, 2^{1221203000321} is an apocalyptic number.

It is an amenable number.

1221203000321 is a deficient number, since it is larger than the sum of its proper divisors (825780223).

1221203000321 is a wasteful number, since it uses less digits than its factorization.

1221203000321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142111.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1221203000321 its reverse (1230003021221), we get a palindrome (2451206021542).

The spelling of 1221203000321 in words is "one trillion, two hundred twenty-one billion, two hundred three million, three hundred twenty-one", and thus it is an aban number.