21641123850 has 192 divisors, whose sum is σ = 57322045440. Its totient is φ = 5393606400.

The previous prime is 21641123837. The next prime is 21641123857. The reversal of 21641123850 is 5832114612.

It is not an unprimeable number, because it can be changed into a prime (21641123857) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23754895 + ... + 23755805.

It is an arithmetic number, because the mean of its divisors is an integer number (298552320).

Almost surely, 2^21641123850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21641123850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28661022720).

21641123850 is an abundant number, since it is smaller than the sum of its proper divisors (35680921590).

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

21641123850 is a wasteful number, since it uses less digits than its factorization.

21641123850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 21641123850 in words is "twenty-one billion, six hundred forty-one million, one hundred twenty-three thousand, eight hundred fifty".