2100725550 has 288 divisors, whose sum is σ = 7348458240. Its totient is φ = 436363200.

The previous prime is 2100725527. The next prime is 2100725551. The reversal of 2100725550 is 555270012.

It is a happy number.

2100725550 is a `hidden beast` number, since 2 + 100 + 7 + 2 + 5 + 550 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100725551) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 726207 + ... + 729093.

It is an arithmetic number, because the mean of its divisors is an integer number (25515480).

Almost surely, 2^2100725550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100725550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3674229120).

2100725550 is an abundant number, since it is smaller than the sum of its proper divisors (5247732690).

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

2100725550 is a wasteful number, since it uses less digits than its factorization.

2100725550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933 (or 2915 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 2100725550 is about 45833.6726654105. The cubic root of 2100725550 is about 1280.7266280398.

Adding to 2100725550 its reverse (555270012), we get a palindrome (2655995562).

The spelling of 2100725550 in words is "two billion, one hundred million, seven hundred twenty-five thousand, five hundred fifty".