21432000723 has 32 divisors (see below), whose sum is σ = 33125554176. Its totient is φ = 12071835648.

The previous prime is 21432000713. The next prime is 21432000839. The reversal of 21432000723 is 32700023412.

It is not a de Polignac number, because 21432000723 - 2⁹ = 21432000211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21432000693 and 21432000702.

It is not an unprimeable number, because it can be changed into a prime (21432000713) 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 31 ways as a sum of consecutive naturals, for example, 3502915 + ... + 3509027.

It is an arithmetic number, because the mean of its divisors is an integer number (1035173568).

Almost surely, 2^21432000723 is an apocalyptic number.

21432000723 is a deficient number, since it is larger than the sum of its proper divisors (11693553453).

21432000723 is a wasteful number, since it uses less digits than its factorization.

21432000723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8483.

The product of its (nonzero) digits is 2016, while the sum is 24.

The spelling of 21432000723 in words is "twenty-one billion, four hundred thirty-two million, seven hundred twenty-three", and thus it is an aban number.