21234177533 has 4 divisors (see below), whose sum is σ = 21533250528. Its totient is φ = 20935104540.

The previous prime is 21234177511. The next prime is 21234177571. The reversal of 21234177533 is 33577143212.

It is a happy number.

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 21234177533 - 2³² = 16939210237 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 (21234177583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149536391 + ... + 149536532.

It is an arithmetic number, because the mean of its divisors is an integer number (5383312632).

Almost surely, 2^21234177533 is an apocalyptic number.

It is an amenable number.

21234177533 is a deficient number, since it is larger than the sum of its proper divisors (299072995).

21234177533 is an equidigital number, since it uses as much as digits as its factorization.

21234177533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299072994.

The product of its digits is 105840, while the sum is 38.

The spelling of 21234177533 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, five hundred thirty-three".