21044022830 has 32 divisors (see below), whose sum is σ = 38162465280. Its totient is φ = 8354868480.

The previous prime is 21044022829. The next prime is 21044022859. The reversal of 21044022830 is 3822044012.

It is a super-2 number, since 2×21044022830² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21044022830.

It is a congruent number.

It is an unprimeable number.

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, 860816 + ... + 884924.

It is an arithmetic number, because the mean of its divisors is an integer number (1192577040).

Almost surely, 2^21044022830 is an apocalyptic number.

21044022830 is a deficient number, since it is larger than the sum of its proper divisors (17118442450).

21044022830 is a wasteful number, since it uses less digits than its factorization.

21044022830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24764.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21044022830 its reverse (3822044012), we get a palindrome (24866066842).

The spelling of 21044022830 in words is "twenty-one billion, forty-four million, twenty-two thousand, eight hundred thirty".