21082820850 has 720 divisors, whose sum is σ = 75855561600. Its totient is φ = 4160782080.

The previous prime is 21082820821. The next prime is 21082820881. The reversal of 21082820850 is 5802828012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 266871111 + ... + 266871189.

Almost surely, 2^21082820850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21082820850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37927780800).

21082820850 is an abundant number, since it is smaller than the sum of its proper divisors (54772740750).

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

21082820850 is a wasteful number, since it uses less digits than its factorization.

21082820850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The spelling of 21082820850 in words is "twenty-one billion, eighty-two million, eight hundred twenty thousand, eight hundred fifty".