21042124010 has 8 divisors (see below), whose sum is σ = 37875823236. Its totient is φ = 8416849600.

The previous prime is 21042124001. The next prime is 21042124013. The reversal of 21042124010 is 1042124012.

It can be written as a sum of positive squares in 2 ways, for example, as 20499653329 + 542470681 = 143177^2 + 23291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21042124010.

It is not an unprimeable number, because it can be changed into a prime (21042124013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052106191 + ... + 1052106210.

Almost surely, 2^21042124010 is an apocalyptic number.

21042124010 is a deficient number, since it is larger than the sum of its proper divisors (16833699226).

21042124010 is a wasteful number, since it uses less digits than its factorization.

21042124010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104212408.

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

Adding to 21042124010 its reverse (1042124012), we get a palindrome (22084248022).

The spelling of 21042124010 in words is "twenty-one billion, forty-two million, one hundred twenty-four thousand, ten".