125415021100 has 72 divisors (see below), whose sum is σ = 281640567600. Its totient is φ = 48418003200.

The previous prime is 125415021079. The next prime is 125415021101. The reversal of 125415021100 is 1120514521.

It is not an unprimeable number, because it can be changed into a prime (125415021101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9769486 + ... + 9782314.

It is an arithmetic number, because the mean of its divisors is an integer number (3911674550).

Almost surely, 2^125415021100 is an apocalyptic number.

125415021100 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 125415021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140820283800).

125415021100 is an abundant number, since it is smaller than the sum of its proper divisors (156225546500).

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

125415021100 is a wasteful number, since it uses less digits than its factorization.

125415021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16243 (or 16236 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 125415021100 its reverse (1120514521), we get a palindrome (126535535621).

The spelling of 125415021100 in words is "one hundred twenty-five billion, four hundred fifteen million, twenty-one thousand, one hundred".