21053435234 has 8 divisors (see below), whose sum is σ = 34009395420. Its totient is φ = 9716970096.

The previous prime is 21053435191. The next prime is 21053435281. The reversal of 21053435234 is 43253435012.

It can be written as a sum of positive squares in 2 ways, for example, as 15178979209 + 5874456025 = 123203^2 + 76645^2 .

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 21053435234.

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 3 ways as a sum of consecutive naturals, for example, 404873729 + ... + 404873780.

Almost surely, 2^21053435234 is an apocalyptic number.

21053435234 is a deficient number, since it is larger than the sum of its proper divisors (12955960186).

21053435234 is a wasteful number, since it uses less digits than its factorization.

21053435234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809747524.

The product of its (nonzero) digits is 43200, while the sum is 32.

The spelling of 21053435234 in words is "twenty-one billion, fifty-three million, four hundred thirty-five thousand, two hundred thirty-four".