21888434533 has 4 divisors (see below), whose sum is σ = 25015353760. Its totient is φ = 18761515308.

The previous prime is 21888434527. The next prime is 21888434591. The reversal of 21888434533 is 33543488812.

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 21888434533 - 2²⁹ = 21351563621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21888434333) 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, 1563459603 + ... + 1563459616.

It is an arithmetic number, because the mean of its divisors is an integer number (6253838440).

Almost surely, 2^21888434533 is an apocalyptic number.

It is an amenable number.

21888434533 is a deficient number, since it is larger than the sum of its proper divisors (3126919227).

21888434533 is an equidigital number, since it uses as much as digits as its factorization.

21888434533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126919226.

The product of its digits is 2211840, while the sum is 49.

The spelling of 21888434533 in words is "twenty-one billion, eight hundred eighty-eight million, four hundred thirty-four thousand, five hundred thirty-three".