21727272313 has 4 divisors (see below), whose sum is σ = 21737057188. Its totient is φ = 21717487440.

The previous prime is 21727272289. The next prime is 21727272353. The reversal of 21727272313 is 31327272712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6211331344 + 15515940969 = 78812^2 + 124563^2 .

It is a cyclic number.

It is not a de Polignac number, because 21727272313 - 2¹³ = 21727264121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21727272353) 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, 4889106 + ... + 4893547.

It is an arithmetic number, because the mean of its divisors is an integer number (5434264297).

Almost surely, 2^21727272313 is an apocalyptic number.

It is an amenable number.

21727272313 is a deficient number, since it is larger than the sum of its proper divisors (9784875).

21727272313 is an equidigital number, since it uses as much as digits as its factorization.

21727272313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9784874.

The product of its digits is 49392, while the sum is 37.

The spelling of 21727272313 in words is "twenty-one billion, seven hundred twenty-seven million, two hundred seventy-two thousand, three hundred thirteen".