21012540013 has 8 divisors (see below), whose sum is σ = 21046288320. Its totient is φ = 20978818560.

The previous prime is 21012540011. The next prime is 21012540047. The reversal of 21012540013 is 31004521012.

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 21012540013 - 2¹ = 21012540011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012540011) 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 7 ways as a sum of consecutive naturals, for example, 2021293 + ... + 2031661.

It is an arithmetic number, because the mean of its divisors is an integer number (2630786040).

Almost surely, 2^21012540013 is an apocalyptic number.

It is an amenable number.

21012540013 is a deficient number, since it is larger than the sum of its proper divisors (33748307).

21012540013 is a wasteful number, since it uses less digits than its factorization.

21012540013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13427.

The product of its (nonzero) digits is 240, while the sum is 19.

The spelling of 21012540013 in words is "twenty-one billion, twelve million, five hundred forty thousand, thirteen".