21130013042 has 8 divisors (see below), whose sum is σ = 32021772636. Its totient is φ = 10456088832.

The previous prime is 21130013041. The next prime is 21130013059. The reversal of 21130013042 is 24031003112.

It can be written as a sum of positive squares in 2 ways, for example, as 21129820321 + 192721 = 145361^2 + 439^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21130013042.

It is not an unprimeable number, because it can be changed into a prime (21130013041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54458603 + ... + 54458990.

Almost surely, 2^21130013042 is an apocalyptic number.

21130013042 is a deficient number, since it is larger than the sum of its proper divisors (10891759594).

21130013042 is a wasteful number, since it uses less digits than its factorization.

21130013042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108917692.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130013042 its reverse (24031003112), we get a palindrome (45161016154).

The spelling of 21130013042 in words is "twenty-one billion, one hundred thirty million, thirteen thousand, forty-two".