1215123477120 has 384 divisors, whose sum is σ = 4950093358080. Its totient is φ = 268782796800.

The previous prime is 1215123477097. The next prime is 1215123477133. The reversal of 1215123477120 is 217743215121.

1215123477120 is a `hidden beast` number, since 1 + 2 + 151 + 23 + 477 + 12 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 763840 + ... + 1736000.

It is an arithmetic number, because the mean of its divisors is an integer number (12890868120).

Almost surely, 2^{1215123477120} is an apocalyptic number.

1215123477120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215123477120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2475046679040).

1215123477120 is an abundant number, since it is smaller than the sum of its proper divisors (3734969880960).

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

1215123477120 is a wasteful number, since it uses less digits than its factorization.

1215123477120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972224 (or 972209 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 1215123477120 in words is "one trillion, two hundred fifteen billion, one hundred twenty-three million, four hundred seventy-seven thousand, one hundred twenty".