21928529444 has 6 divisors (see below), whose sum is σ = 38374926534. Its totient is φ = 10964264720.

The previous prime is 21928529437. The next prime is 21928529459. The reversal of 21928529444 is 44492582912.

It can be written as a sum of positive squares in only one way, i.e., 21915841600 + 12687844 = 148040^2 + 3562^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21928529392 and 21928529401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2741066177 + ... + 2741066184.

It is an arithmetic number, because the mean of its divisors is an integer number (6395821089).

Almost surely, 2^21928529444 is an apocalyptic number.

It is an amenable number.

21928529444 is a deficient number, since it is larger than the sum of its proper divisors (16446397090).

21928529444 is a wasteful number, since it uses less digits than its factorization.

21928529444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5482132365 (or 5482132363 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 50.

The spelling of 21928529444 in words is "twenty-one billion, nine hundred twenty-eight million, five hundred twenty-nine thousand, four hundred forty-four".