1215543401011 has 8 divisors (see below), whose sum is σ = 1230212136384. Its totient is φ = 1200875228520.

The previous prime is 1215543400937. The next prime is 1215543401053. The reversal of 1215543401011 is 1101043455121.

It is a happy number.

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 1215543401011 - 2³³ = 1206953466419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215543401071) 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, 5616396 + ... + 5828806.

It is an arithmetic number, because the mean of its divisors is an integer number (153776517048).

Almost surely, 2^{1215543401011} is an apocalyptic number.

1215543401011 is a deficient number, since it is larger than the sum of its proper divisors (14668735373).

1215543401011 is an equidigital number, since it uses as much as digits as its factorization.

1215543401011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281441.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 1215543401011 its reverse (1101043455121), we get a palindrome (2316586856132).

The spelling of 1215543401011 in words is "one trillion, two hundred fifteen billion, five hundred forty-three million, four hundred one thousand, eleven".