1215052523021 has 4 divisors (see below), whose sum is σ = 1215282957372. Its totient is φ = 1214822088672.

The previous prime is 1215052522997. The next prime is 1215052523033. The reversal of 1215052523021 is 1203252505121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 801750114025 + 413302408996 = 895405^2 + 642886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215052523021 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 (1215052523521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115209266 + ... + 115219811.

It is an arithmetic number, because the mean of its divisors is an integer number (303820739343).

Almost surely, 2^{1215052523021} is an apocalyptic number.

It is an amenable number.

1215052523021 is a deficient number, since it is larger than the sum of its proper divisors (230434351).

1215052523021 is an equidigital number, since it uses as much as digits as its factorization.

1215052523021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230434350.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 1215052523021 in words is "one trillion, two hundred fifteen billion, fifty-two million, five hundred twenty-three thousand, twenty-one".