21004342013 has 8 divisors (see below), whose sum is σ = 21569806080. Its totient is φ = 20446367760.

The previous prime is 21004341991. The next prime is 21004342039. The reversal of 21004342013 is 31024340012.

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

It is a cyclic number.

It is not a de Polignac number, because 21004342013 - 2³⁰ = 19930600189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004342043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1866770 + ... + 1877987.

It is an arithmetic number, because the mean of its divisors is an integer number (2696225760).

Almost surely, 2^21004342013 is an apocalyptic number.

It is an amenable number.

21004342013 is a deficient number, since it is larger than the sum of its proper divisors (565464067).

21004342013 is an equidigital number, since it uses as much as digits as its factorization.

21004342013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744907.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21004342013 its reverse (31024340012), we get a palindrome (52028682025).

The spelling of 21004342013 in words is "twenty-one billion, four million, three hundred forty-two thousand, thirteen".