21727659813 has 8 divisors (see below), whose sum is σ = 29753191968. Its totient is φ = 14093617104.

The previous prime is 21727659791. The next prime is 21727659827. The reversal of 21727659813 is 31895672712.

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

It is not a de Polignac number, because 21727659813 - 2¹⁴ = 21727643429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21727659413) 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, 97872231 + ... + 97872452.

It is an arithmetic number, because the mean of its divisors is an integer number (3719148996).

Almost surely, 2^21727659813 is an apocalyptic number.

It is an amenable number.

21727659813 is a deficient number, since it is larger than the sum of its proper divisors (8025532155).

21727659813 is a wasteful number, since it uses less digits than its factorization.

21727659813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195744723.

The product of its digits is 1270080, while the sum is 51.

The spelling of 21727659813 in words is "twenty-one billion, seven hundred twenty-seven million, six hundred fifty-nine thousand, eight hundred thirteen".