21124242002 has 8 divisors (see below), whose sum is σ = 32778996300. Its totient is φ = 10197909904.

The previous prime is 21124241993. The next prime is 21124242023. The reversal of 21124242002 is 20024242112.

It can be written as a sum of positive squares in 2 ways, for example, as 19376918401 + 1747323601 = 139201^2 + 41801^2 .

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

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, 182105477 + ... + 182105592.

Almost surely, 2^21124242002 is an apocalyptic number.

21124242002 is a deficient number, since it is larger than the sum of its proper divisors (11654754298).

21124242002 is a wasteful number, since it uses less digits than its factorization.

21124242002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364211100.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21124242002 its reverse (20024242112), we get a palindrome (41148484114).

The spelling of 21124242002 in words is "twenty-one billion, one hundred twenty-four million, two hundred forty-two thousand, two".