1215445103221 has 8 divisors (see below), whose sum is σ = 1236871541504. Its totient is φ = 1194067087920.

The previous prime is 1215445103207. The next prime is 1215445103251. The reversal of 1215445103221 is 1223015445121.

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 1215445103221 - 2¹¹ = 1215445101173 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 (1215445103251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12055101 + ... + 12155506.

It is an arithmetic number, because the mean of its divisors is an integer number (154608942688).

Almost surely, 2^{1215445103221} is an apocalyptic number.

It is an amenable number.

1215445103221 is a deficient number, since it is larger than the sum of its proper divisors (21426438283).

1215445103221 is an equidigital number, since it uses as much as digits as its factorization.

1215445103221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24211491.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 1215445103221 in words is "one trillion, two hundred fifteen billion, four hundred forty-five million, one hundred three thousand, two hundred twenty-one".