1215554231101 has 32 divisors (see below), whose sum is σ = 1497470976000. Its totient is φ = 963621090432.

The previous prime is 1215554231051. The next prime is 1215554231131. The reversal of 1215554231101 is 1011324555121.

It is not a de Polignac number, because 1215554231101 - 2⁹ = 1215554230589 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 (1215554231131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285180 + ... + 1585066.

It is an arithmetic number, because the mean of its divisors is an integer number (46795968000).

Almost surely, 2^{1215554231101} is an apocalyptic number.

It is an amenable number.

1215554231101 is a deficient number, since it is larger than the sum of its proper divisors (281916744899).

1215554231101 is a wasteful number, since it uses less digits than its factorization.

1215554231101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300081.

The product of its (nonzero) digits is 6000, while the sum is 31.

Adding to 1215554231101 its reverse (1011324555121), we get a palindrome (2226878786222).

The spelling of 1215554231101 in words is "one trillion, two hundred fifteen billion, five hundred fifty-four million, two hundred thirty-one thousand, one hundred one".