21115141025050 has 24 divisors (see below), whose sum is σ = 39437125658172. Its totient is φ = 8411010528000.

The previous prime is 21115141025021. The next prime is 21115141025051. The reversal of 21115141025050 is 5052014151112.

It can be written as a sum of positive squares in 6 ways, for example, as 5312854431369 + 15802286593681 = 2304963^2 + 3975209^2 .

It is not an unprimeable number, because it can be changed into a prime (21115141025051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 876134881 + ... + 876158980.

Almost surely, 2^{21115141025050} is an apocalyptic number.

21115141025050 is a deficient number, since it is larger than the sum of its proper divisors (18321984633122).

21115141025050 is a wasteful number, since it uses less digits than its factorization.

21115141025050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752294114 (or 1752294109 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 28.

Adding to 21115141025050 its reverse (5052014151112), we get a palindrome (26167155176162).

The spelling of 21115141025050 in words is "twenty-one trillion, one hundred fifteen billion, one hundred forty-one million, twenty-five thousand, fifty".