21128589244 has 48 divisors (see below), whose sum is σ = 43764295680. Its totient is φ = 8737585920.

The previous prime is 21128589211. The next prime is 21128589259. The reversal of 21128589244 is 44298582112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21128589194 and 21128589203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19629 + ... + 206500.

It is an arithmetic number, because the mean of its divisors is an integer number (911756160).

Almost surely, 2^21128589244 is an apocalyptic number.

It is an amenable number.

21128589244 is an abundant number, since it is smaller than the sum of its proper divisors (22635706436).

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

21128589244 is a wasteful number, since it uses less digits than its factorization.

21128589244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226258 (or 226256 counting only the distinct ones).

The product of its digits is 368640, while the sum is 46.

The spelling of 21128589244 in words is "twenty-one billion, one hundred twenty-eight million, five hundred eighty-nine thousand, two hundred forty-four".