20512121250 has 40 divisors (see below), whose sum is σ = 51263902800. Its totient is φ = 5469898000.

The previous prime is 20512121159. The next prime is 20512121293. The reversal of 20512121250 is 5212121502.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2731200 + ... + 2738699.

It is an arithmetic number, because the mean of its divisors is an integer number (1281597570).

Almost surely, 2^20512121250 is an apocalyptic number.

20512121250 is an abundant number, since it is smaller than the sum of its proper divisors (30751781550).

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

20512121250 is an equidigital number, since it uses as much as digits as its factorization.

20512121250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5469924 (or 5469909 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 20512121250 its reverse (5212121502), we get a palindrome (25724242752).

The spelling of 20512121250 in words is "twenty billion, five hundred twelve million, one hundred twenty-one thousand, two hundred fifty".