51245210000 has 50 divisors (see below), whose sum is σ = 124069802142. Its totient is φ = 20498080000.

The previous prime is 51245209987. The next prime is 51245210041. The reversal of 51245210000 is 1254215.

It can be written as a sum of positive squares in 5 ways, for example, as 30170300416 + 21074909584 = 173696^2 + 145172^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2552261 + ... + 2572260.

Almost surely, 2^51245210000 is an apocalyptic number.

51245210000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51245210000 is an abundant number, since it is smaller than the sum of its proper divisors (72824592142).

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

51245210000 is an equidigital number, since it uses as much as digits as its factorization.

51245210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124549 (or 5124528 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 51245210000 its reverse (1254215), we get a palindrome (51246464215).

The spelling of 51245210000 in words is "fifty-one billion, two hundred forty-five million, two hundred ten thousand".