21420130010 has 16 divisors (see below), whose sum is σ = 38566456776. Its totient is φ = 8565780288.

The previous prime is 21420129971. The next prime is 21420130013. The reversal of 21420130010 is 1003102412.

It can be written as a sum of positive squares in 4 ways, for example, as 12836663401 + 8583466609 = 113299^2 + 92647^2 .

It is not an unprimeable number, because it can be changed into a prime (21420130013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244097 + ... + 320036.

Almost surely, 2^21420130010 is an apocalyptic number.

21420130010 is a deficient number, since it is larger than the sum of its proper divisors (17146326766).

21420130010 is a wasteful number, since it uses less digits than its factorization.

21420130010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567937.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21420130010 its reverse (1003102412), we get a palindrome (22423232422).

The spelling of 21420130010 in words is "twenty-one billion, four hundred twenty million, one hundred thirty thousand, ten".