21013245142 has 32 divisors (see below), whose sum is σ = 33290611200. Its totient is φ = 9927707328.

The previous prime is 21013245109. The next prime is 21013245151. The reversal of 21013245142 is 24154231012.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6823159 + ... + 6826237.

It is an arithmetic number, because the mean of its divisors is an integer number (1040331600).

Almost surely, 2^21013245142 is an apocalyptic number.

21013245142 is a deficient number, since it is larger than the sum of its proper divisors (12277366058).

21013245142 is a wasteful number, since it uses less digits than its factorization.

21013245142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4860.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21013245142 its reverse (24154231012), we get a palindrome (45167476154).

The spelling of 21013245142 in words is "twenty-one billion, thirteen million, two hundred forty-five thousand, one hundred forty-two".