21243140102 has 8 divisors (see below), whose sum is σ = 32605750056. Its totient is φ = 10374556752.

The previous prime is 21243140099. The next prime is 21243140111. The reversal of 21243140102 is 20104134212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123506543 + ... + 123506714.

It is an arithmetic number, because the mean of its divisors is an integer number (4075718757).

Almost surely, 2^21243140102 is an apocalyptic number.

21243140102 is a deficient number, since it is larger than the sum of its proper divisors (11362609954).

21243140102 is a wasteful number, since it uses less digits than its factorization.

21243140102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247013302.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21243140102 its reverse (20104134212), we get a palindrome (41347274314).

The spelling of 21243140102 in words is "twenty-one billion, two hundred forty-three million, one hundred forty thousand, one hundred two".