21727349281 has 8 divisors (see below), whose sum is σ = 24950066400. Its totient is φ = 18712549440.

The previous prime is 21727349249. The next prime is 21727349321. The reversal of 21727349281 is 18294372712.

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 21727349281 - 2⁵ = 21727349249 is a prime.

It is a super-2 number, since 2×21727349281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21727349201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51979096 + ... + 51979513.

It is an arithmetic number, because the mean of its divisors is an integer number (3118758300).

Almost surely, 2^21727349281 is an apocalyptic number.

It is an amenable number.

21727349281 is a deficient number, since it is larger than the sum of its proper divisors (3222717119).

21727349281 is a wasteful number, since it uses less digits than its factorization.

21727349281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103958639.

The product of its digits is 338688, while the sum is 46.

The spelling of 21727349281 in words is "twenty-one billion, seven hundred twenty-seven million, three hundred forty-nine thousand, two hundred eighty-one".