21544163430 has 32 divisors (see below), whose sum is σ = 51729124608. Its totient is φ = 5742540000.

The previous prime is 21544163401. The next prime is 21544163437. The reversal of 21544163430 is 3436144512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21544163391 and 21544163400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544163437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91986 + ... + 227045.

It is an arithmetic number, because the mean of its divisors is an integer number (1616535144).

Almost surely, 2^21544163430 is an apocalyptic number.

21544163430 is an abundant number, since it is smaller than the sum of its proper divisors (30184961178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21544163430 is a wasteful number, since it uses less digits than its factorization.

21544163430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321292.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 21544163430 in words is "twenty-one billion, five hundred forty-four million, one hundred sixty-three thousand, four hundred thirty".