21240142013 has 16 divisors (see below), whose sum is σ = 22317335040. Its totient is φ = 20196301104.

The previous prime is 21240141991. The next prime is 21240142037. The reversal of 21240142013 is 31024104212.

It is a cyclic number.

It is not a de Polignac number, because 21240142013 - 2⁸ = 21240141757 is a prime.

It is a super-2 number, since 2×21240142013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240142093) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 220670 + ... + 301952.

It is an arithmetic number, because the mean of its divisors is an integer number (1394833440).

Almost surely, 2^21240142013 is an apocalyptic number.

It is an amenable number.

21240142013 is a deficient number, since it is larger than the sum of its proper divisors (1077193027).

21240142013 is a wasteful number, since it uses less digits than its factorization.

21240142013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81488.

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

Adding to 21240142013 its reverse (31024104212), we get a palindrome (52264246225).

The spelling of 21240142013 in words is "twenty-one billion, two hundred forty million, one hundred forty-two thousand, thirteen".