1215405220050 has 192 divisors, whose sum is σ = 3865461523200. Its totient is φ = 275056128000.

The previous prime is 1215405219997. The next prime is 1215405220063. The reversal of 1215405220050 is 500225045121.

1215405220050 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 405 + 2 + 200 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1215405219996 and 1215405220023.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 317746 + ... + 1591154.

It is an arithmetic number, because the mean of its divisors is an integer number (20132612100).

Almost surely, 2^{1215405220050} is an apocalyptic number.

1215405220050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215405220050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932730761600).

1215405220050 is an abundant number, since it is smaller than the sum of its proper divisors (2650056303150).

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

1215405220050 is a wasteful number, since it uses less digits than its factorization.

1215405220050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273538 (or 1273527 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 1215405220050 in words is "one trillion, two hundred fifteen billion, four hundred five million, two hundred twenty thousand, fifty".