21115211150 has 96 divisors (see below), whose sum is σ = 44320663296. Its totient is φ = 7417440000.

The previous prime is 21115211149. The next prime is 21115211167. The reversal of 21115211150 is 5111251112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2318105 + ... + 2327195.

It is an arithmetic number, because the mean of its divisors is an integer number (461673576).

Almost surely, 2^21115211150 is an apocalyptic number.

21115211150 is an abundant number, since it is smaller than the sum of its proper divisors (23205452146).

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

21115211150 is a wasteful number, since it uses less digits than its factorization.

21115211150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9258 (or 9253 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 20.

Adding to 21115211150 its reverse (5111251112), we get a palindrome (26226462262).

The spelling of 21115211150 in words is "twenty-one billion, one hundred fifteen million, two hundred eleven thousand, one hundred fifty".