21763043449 has 4 divisors (see below), whose sum is σ = 24872049664. Its totient is φ = 18654037236.

The previous prime is 21763043443. The next prime is 21763043473. The reversal of 21763043449 is 94434036712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21763043449 - 2⁷ = 21763043321 is a prime.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1554503097 + ... + 1554503110.

It is an arithmetic number, because the mean of its divisors is an integer number (6218012416).

Almost surely, 2^21763043449 is an apocalyptic number.

It is an amenable number.

21763043449 is a deficient number, since it is larger than the sum of its proper divisors (3109006215).

21763043449 is an equidigital number, since it uses as much as digits as its factorization.

21763043449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109006214.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 21763043449 in words is "twenty-one billion, seven hundred sixty-three million, forty-three thousand, four hundred forty-nine".