21350066390 has 8 divisors (see below), whose sum is σ = 38430119520. Its totient is φ = 8540026552.

The previous prime is 21350066371. The next prime is 21350066401. The reversal of 21350066390 is 9366005312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21350066390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067503310 + ... + 1067503329.

It is an arithmetic number, because the mean of its divisors is an integer number (4803764940).

Almost surely, 2^21350066390 is an apocalyptic number.

21350066390 is a deficient number, since it is larger than the sum of its proper divisors (17080053130).

21350066390 is a wasteful number, since it uses less digits than its factorization.

21350066390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135006646.

The product of its (nonzero) digits is 29160, while the sum is 35.

The spelling of 21350066390 in words is "twenty-one billion, three hundred fifty million, sixty-six thousand, three hundred ninety".