21276548447 has 8 divisors (see below), whose sum is σ = 26526605952. Its totient is φ = 16579128600.

The previous prime is 21276548443. The next prime is 21276548459. The reversal of 21276548447 is 74484567212.

It is a happy number.

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 21276548447 - 2² = 21276548443 is a prime.

It is a super-2 number, since 2×21276548447² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21276548395 and 21276548404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276548443) 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, 138159329 + ... + 138159482.

It is an arithmetic number, because the mean of its divisors is an integer number (3315825744).

Almost surely, 2^21276548447 is an apocalyptic number.

21276548447 is a deficient number, since it is larger than the sum of its proper divisors (5250057505).

21276548447 is a wasteful number, since it uses less digits than its factorization.

21276548447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276318829.

The product of its digits is 3010560, while the sum is 50.

The spelling of 21276548447 in words is "twenty-one billion, two hundred seventy-six million, five hundred forty-eight thousand, four hundred forty-seven".