21112011250 has 80 divisors (see below), whose sum is σ = 43261526880. Its totient is φ = 7660800000.

The previous prime is 21112011191. The next prime is 21112011287. The reversal of 21112011250 is 5211021112.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7849906 + ... + 7852594.

It is an arithmetic number, because the mean of its divisors is an integer number (540769086).

Almost surely, 2^21112011250 is an apocalyptic number.

21112011250 is an abundant number, since it is smaller than the sum of its proper divisors (22149515630).

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

21112011250 is a wasteful number, since it uses less digits than its factorization.

21112011250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293 (or 3278 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21112011250 its reverse (5211021112), we get a palindrome (26323032362).

The spelling of 21112011250 in words is "twenty-one billion, one hundred twelve million, eleven thousand, two hundred fifty".