21071051935 has 8 divisors (see below), whose sum is σ = 25313023296. Its totient is φ = 16838334240.

The previous prime is 21071051921. The next prime is 21071051993. The reversal of 21071051935 is 53915017012.

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

It is not a de Polignac number, because 21071051935 - 2¹⁷ = 21070920863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21071051935.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2308404 + ... + 2317513.

It is an arithmetic number, because the mean of its divisors is an integer number (3164127912).

Almost surely, 2^21071051935 is an apocalyptic number.

21071051935 is a deficient number, since it is larger than the sum of its proper divisors (4241971361).

21071051935 is an equidigital number, since it uses as much as digits as its factorization.

21071051935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626833.

The product of its (nonzero) digits is 9450, while the sum is 34.

Adding to 21071051935 its reverse (53915017012), we get a palindrome (74986068947).

The spelling of 21071051935 in words is "twenty-one billion, seventy-one million, fifty-one thousand, nine hundred thirty-five".