21013027674637 has 4 divisors (see below), whose sum is σ = 21032288012736. Its totient is φ = 20993767336540.

The previous prime is 21013027674571. The next prime is 21013027674647. The reversal of 21013027674637 is 73647672031012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21013027674637 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013027674647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9630167413 + ... + 9630169594.

It is an arithmetic number, because the mean of its divisors is an integer number (5258072003184).

Almost surely, 2^{21013027674637} is an apocalyptic number.

It is an amenable number.

21013027674637 is a deficient number, since it is larger than the sum of its proper divisors (19260338099).

21013027674637 is a wasteful number, since it uses less digits than its factorization.

21013027674637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19260338098.

The product of its (nonzero) digits is 1778112, while the sum is 49.

The spelling of 21013027674637 in words is "twenty-one trillion, thirteen billion, twenty-seven million, six hundred seventy-four thousand, six hundred thirty-seven".