21043242410 has 8 divisors (see below), whose sum is σ = 37877836356. Its totient is φ = 8417296960.

The previous prime is 21043242391. The next prime is 21043242431. The reversal of 21043242410 is 1424234012.

It can be written as a sum of positive squares in 2 ways, for example, as 19572289801 + 1470952609 = 139901^2 + 38353^2 .

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

It is a super-2 number, since 2×21043242410² (a number of 21 digits) contains 22 as substring.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 1052162111 + ... + 1052162130.

Almost surely, 2^21043242410 is an apocalyptic number.

21043242410 is a deficient number, since it is larger than the sum of its proper divisors (16834593946).

21043242410 is a wasteful number, since it uses less digits than its factorization.

21043242410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104324248.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21043242410 its reverse (1424234012), we get a palindrome (22467476422).

The spelling of 21043242410 in words is "twenty-one billion, forty-three million, two hundred forty-two thousand, four hundred ten".