21733961819 has 4 divisors (see below), whose sum is σ = 21741571944. Its totient is φ = 21726351696.

The previous prime is 21733961783. The next prime is 21733961827. The reversal of 21733961819 is 91816933712.

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

It is a cyclic number.

It is not a de Polignac number, because 21733961819 - 2²⁸ = 21465526363 is a prime.

It is a super-2 number, since 2×21733961819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21733960819) by changing a digit.

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, 3800777 + ... + 3806490.

It is an arithmetic number, because the mean of its divisors is an integer number (5435392986).

Almost surely, 2^21733961819 is an apocalyptic number.

21733961819 is a deficient number, since it is larger than the sum of its proper divisors (7610125).

21733961819 is an equidigital number, since it uses as much as digits as its factorization.

21733961819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7610124.

The product of its digits is 489888, while the sum is 50.

The spelling of 21733961819 in words is "twenty-one billion, seven hundred thirty-three million, nine hundred sixty-one thousand, eight hundred nineteen".