21320403044 has 48 divisors (see below), whose sum is σ = 40005772800. Its totient is φ = 9911808000.

The previous prime is 21320403043. The next prime is 21320403073. The reversal of 21320403044 is 44030402312.

It is not an unprimeable number, because it can be changed into a prime (21320403043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2215844 + ... + 2225444.

It is an arithmetic number, because the mean of its divisors is an integer number (833453600).

Almost surely, 2^21320403044 is an apocalyptic number.

It is an amenable number.

21320403044 is a deficient number, since it is larger than the sum of its proper divisors (18685369756).

21320403044 is a wasteful number, since it uses less digits than its factorization.

21320403044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10164 (or 10162 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21320403044 its reverse (44030402312), we get a palindrome (65350805356).

The spelling of 21320403044 in words is "twenty-one billion, three hundred twenty million, four hundred three thousand, forty-four".