21641746350 has 192 divisors, whose sum is σ = 63721635840. Its totient is φ = 4756579200.

The previous prime is 21641746349. The next prime is 21641746409. The reversal of 21641746350 is 5364714612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21641746299 and 21641746308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5303611 + ... + 5307689.

It is an arithmetic number, because the mean of its divisors is an integer number (331883520).

Almost surely, 2^21641746350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21641746350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31860817920).

21641746350 is an abundant number, since it is smaller than the sum of its proper divisors (42079889490).

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

21641746350 is a wasteful number, since it uses less digits than its factorization.

21641746350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295 (or 4290 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21641746350 in words is "twenty-one billion, six hundred forty-one million, seven hundred forty-six thousand, three hundred fifty".