21144130102 has 4 divisors (see below), whose sum is σ = 31716195156. Its totient is φ = 10572065050.

The previous prime is 21144130087. The next prime is 21144130129. The reversal of 21144130102 is 20103144112.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21144130102.

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 as a sum of consecutive naturals, namely, 5286032524 + ... + 5286032527.

It is an arithmetic number, because the mean of its divisors is an integer number (7929048789).

Almost surely, 2^21144130102 is an apocalyptic number.

21144130102 is a deficient number, since it is larger than the sum of its proper divisors (10572065054).

21144130102 is a wasteful number, since it uses less digits than its factorization.

21144130102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10572065053.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21144130102 its reverse (20103144112), we get a palindrome (41247274214).

The spelling of 21144130102 in words is "twenty-one billion, one hundred forty-four million, one hundred thirty thousand, one hundred two".