21954723433 has 8 divisors (see below), whose sum is σ = 22050390600. Its totient is φ = 21859244160.

The previous prime is 21954723403. The next prime is 21954723437. The reversal of 21954723433 is 33432745912.

It can be written as a sum of positive squares in 4 ways, for example, as 4988879424 + 16965844009 = 70632^2 + 130253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21954723433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21954723433.

It is not an unprimeable number, because it can be changed into a prime (21954723437) 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 7 ways as a sum of consecutive naturals, for example, 189813 + ... + 282733.

It is an arithmetic number, because the mean of its divisors is an integer number (2756298825).

Almost surely, 2^21954723433 is an apocalyptic number.

It is an amenable number.

21954723433 is a deficient number, since it is larger than the sum of its proper divisors (95667167).

21954723433 is an equidigital number, since it uses as much as digits as its factorization.

21954723433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93947.

The product of its digits is 544320, while the sum is 43.

The spelling of 21954723433 in words is "twenty-one billion, nine hundred fifty-four million, seven hundred twenty-three thousand, four hundred thirty-three".