21053831990935 has 4 divisors (see below), whose sum is σ = 25264598389128. Its totient is φ = 16843065592744.

The previous prime is 21053831990921. The next prime is 21053831990941. The reversal of 21053831990935 is 53909913835012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21053831990935 - 2¹¹ = 21053831988887 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 21053831990935.

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, 2105383199089 + ... + 2105383199098.

It is an arithmetic number, because the mean of its divisors is an integer number (6316149597282).

Almost surely, 2^{21053831990935} is an apocalyptic number.

21053831990935 is a deficient number, since it is larger than the sum of its proper divisors (4210766398193).

21053831990935 is an equidigital number, since it uses as much as digits as its factorization.

21053831990935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210766398192.

The product of its (nonzero) digits is 7873200, while the sum is 58.

The spelling of 21053831990935 in words is "twenty-one trillion, fifty-three billion, eight hundred thirty-one million, nine hundred ninety thousand, nine hundred thirty-five".