21124402010 has 32 divisors (see below), whose sum is σ = 38767833360. Its totient is φ = 8285787648.

The previous prime is 21124402007. The next prime is 21124402063. The reversal of 21124402010 is 1020442112.

It can be written as a sum of positive squares in 8 ways, for example, as 15654764161 + 5469637849 = 125119^2 + 73957^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21124402010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42656 + ... + 209924.

Almost surely, 2^21124402010 is an apocalyptic number.

21124402010 is a deficient number, since it is larger than the sum of its proper divisors (17643431350).

21124402010 is a wasteful number, since it uses less digits than its factorization.

21124402010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167522.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21124402010 its reverse (1020442112), we get a palindrome (22144844122).

The spelling of 21124402010 in words is "twenty-one billion, one hundred twenty-four million, four hundred two thousand, ten".