1215521051041 has 6 divisors (see below), whose sum is σ = 1336068593426. Its totient is φ = 1105019137200.

The previous prime is 1215521051033. The next prime is 1215521051051. The reversal of 1215521051041 is 1401501255121.

It can be written as a sum of positive squares in only one way, i.e., 688269344400 + 527251706641 = 829620^2 + 726121^2 .

It is not a de Polignac number, because 1215521051041 - 2³ = 1215521051033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215521051051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5022814140 + ... + 5022814381.

Almost surely, 2^{1215521051041} is an apocalyptic number.

1215521051041 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1215521051041 is a deficient number, since it is larger than the sum of its proper divisors (120547542385).

1215521051041 is a wasteful number, since it uses less digits than its factorization.

1215521051041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10045628543 (or 10045628532 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 28.

The spelling of 1215521051041 in words is "one trillion, two hundred fifteen billion, five hundred twenty-one million, fifty-one thousand, forty-one".