1550021541240 has 128 divisors (see below), whose sum is σ = 4927384949760. Its totient is φ = 388725786624.

The previous prime is 1550021541217. The next prime is 1550021541251. The reversal of 1550021541240 is 421451200551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1550021541198 and 1550021541207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2366557 + ... + 2949683.

It is an arithmetic number, because the mean of its divisors is an integer number (38495194920).

Almost surely, 2^{1550021541240} is an apocalyptic number.

1550021541240 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 1550021541240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2463692474880).

1550021541240 is an abundant number, since it is smaller than the sum of its proper divisors (3377363408520).

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

1550021541240 is a wasteful number, since it uses less digits than its factorization.

1550021541240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584461 (or 584457 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 1550021541240 its reverse (421451200551), we get a palindrome (1971472741791).

The spelling of 1550021541240 in words is "one trillion, five hundred fifty billion, twenty-one million, five hundred forty-one thousand, two hundred forty".