21240430102 has 16 divisors (see below), whose sum is σ = 32234122800. Its totient is φ = 10495837440.

The previous prime is 21240430097. The next prime is 21240430121. The reversal of 21240430102 is 20103404212.

It is a self number, because there is not a number n which added to its sum of digits gives 21240430102.

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 7 ways as a sum of consecutive naturals, for example, 357049 + ... + 412267.

It is an arithmetic number, because the mean of its divisors is an integer number (2014632675).

Almost surely, 2^21240430102 is an apocalyptic number.

21240430102 is a deficient number, since it is larger than the sum of its proper divisors (10993692698).

21240430102 is a wasteful number, since it uses less digits than its factorization.

21240430102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57471.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21240430102 its reverse (20103404212), we get a palindrome (41343834314).

The spelling of 21240430102 in words is "twenty-one billion, two hundred forty million, four hundred thirty thousand, one hundred two".