21033710790 has 128 divisors (see below), whose sum is σ = 55010672640. Its totient is φ = 5128800768.

The previous prime is 21033710783. The next prime is 21033710839. The reversal of 21033710790 is 9701733012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2674504 + ... + 2682356.

It is an arithmetic number, because the mean of its divisors is an integer number (429770880).

Almost surely, 2^21033710790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21033710790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27505336320).

21033710790 is an abundant number, since it is smaller than the sum of its proper divisors (33976961850).

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

21033710790 is a wasteful number, since it uses less digits than its factorization.

21033710790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8046.

The product of its (nonzero) digits is 7938, while the sum is 33.

The spelling of 21033710790 in words is "twenty-one billion, thirty-three million, seven hundred ten thousand, seven hundred ninety".