129240250000 has 105 divisors (see below), whose sum is σ = 313435655941. Its totient is φ = 51624200000.

The previous prime is 129240249989. The next prime is 129240250021. The reversal of 129240250000 is 52042921.

The square root of 129240250000 is 359500.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 113226866064 + 16013383936 = 336492^2 + 126544^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 179749641 + ... + 179750359.

Almost surely, 2^129240250000 is an apocalyptic number.

129240250000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129240250000 is the 359500-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129240250000

129240250000 is an abundant number, since it is smaller than the sum of its proper divisors (184195405941).

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

129240250000 is an frugal number, since it uses more digits than its factorization.

129240250000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Multiplying 129240250000 by its sum of digits (25), we get a square (3231006250000 = 1797500²).

129240250000 divided by its sum of digits (25) gives a square (5169610000 = 71900²).

Adding to 129240250000 its reverse (52042921), we get a palindrome (129292292921).

The spelling of 129240250000 in words is "one hundred twenty-nine billion, two hundred forty million, two hundred fifty thousand".