1215111205532 has 72 divisors (see below), whose sum is σ = 2483883208800. Its totient is φ = 518602820736.

The previous prime is 1215111205523. The next prime is 1215111205543. The reversal of 1215111205532 is 2355021115121.

It is a junction number, because it is equal to n+sod(n) for n = 1215111205495 and 1215111205504.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 196077458 + ... + 196083654.

It is an arithmetic number, because the mean of its divisors is an integer number (34498377900).

Almost surely, 2^{1215111205532} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215111205532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1241941604400).

1215111205532 is an abundant number, since it is smaller than the sum of its proper divisors (1268772003268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215111205532 is a wasteful number, since it uses less digits than its factorization.

1215111205532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10203 (or 10194 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 1215111205532 in words is "one trillion, two hundred fifteen billion, one hundred eleven million, two hundred five thousand, five hundred thirty-two".