21763043453 has 4 divisors (see below), whose sum is σ = 21821389788. Its totient is φ = 21704697120.

The previous prime is 21763043443. The next prime is 21763043473. The reversal of 21763043453 is 35434036712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15188590564 + 6574452889 = 123242^2 + 81083^2 .

It is a cyclic number.

It is not a de Polignac number, because 21763043453 - 2⁶ = 21763043389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21763043443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29172608 + ... + 29173353.

It is an arithmetic number, because the mean of its divisors is an integer number (5455347447).

Almost surely, 2^21763043453 is an apocalyptic number.

It is an amenable number.

21763043453 is a deficient number, since it is larger than the sum of its proper divisors (58346335).

21763043453 is an equidigital number, since it uses as much as digits as its factorization.

21763043453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58346334.

The product of its (nonzero) digits is 181440, while the sum is 38.

The spelling of 21763043453 in words is "twenty-one billion, seven hundred sixty-three million, forty-three thousand, four hundred fifty-three".