21730021754 has 8 divisors (see below), whose sum is σ = 37251465888. Its totient is φ = 9312866460.

The previous prime is 21730021723. The next prime is 21730021757. The reversal of 21730021754 is 45712003712.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21730021754.

It is not an unprimeable number, because it can be changed into a prime (21730021757) 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, 776072192 + ... + 776072219.

It is an arithmetic number, because the mean of its divisors is an integer number (4656433236).

Almost surely, 2^21730021754 is an apocalyptic number.

21730021754 is a deficient number, since it is larger than the sum of its proper divisors (15521444134).

21730021754 is a wasteful number, since it uses less digits than its factorization.

21730021754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552144420.

The product of its (nonzero) digits is 11760, while the sum is 32.

The spelling of 21730021754 in words is "twenty-one billion, seven hundred thirty million, twenty-one thousand, seven hundred fifty-four".