1215445453021 has 4 divisors (see below), whose sum is σ = 1216547399232. Its totient is φ = 1214343506812.

The previous prime is 1215445452989. The next prime is 1215445453031. The reversal of 1215445453021 is 1203545445121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1215445453021 - 2⁵ = 1215445452989 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 (1215445453031) 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 3 ways as a sum of consecutive naturals, for example, 550971451 + ... + 550973656.

It is an arithmetic number, because the mean of its divisors is an integer number (304136849808).

Almost surely, 2^{1215445453021} is an apocalyptic number.

It is an amenable number.

1215445453021 is a deficient number, since it is larger than the sum of its proper divisors (1101946211).

1215445453021 is a wasteful number, since it uses less digits than its factorization.

1215445453021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101946210.

The product of its (nonzero) digits is 96000, while the sum is 37.

The spelling of 1215445453021 in words is "one trillion, two hundred fifteen billion, four hundred forty-five million, four hundred fifty-three thousand, twenty-one".