21246675247 has 8 divisors (see below), whose sum is σ = 25337650176. Its totient is φ = 17419634232.

The previous prime is 21246675239. The next prime is 21246675257. The reversal of 21246675247 is 74257664212.

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

It is not a de Polignac number, because 21246675247 - 2³ = 21246675239 is a prime.

It is a super-2 number, since 2×21246675247² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21246675197 and 21246675206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246675227) 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, 65983303 + ... + 65983624.

It is an arithmetic number, because the mean of its divisors is an integer number (3167206272).

Almost surely, 2^21246675247 is an apocalyptic number.

21246675247 is a deficient number, since it is larger than the sum of its proper divisors (4090974929).

21246675247 is a wasteful number, since it uses less digits than its factorization.

21246675247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131966957.

The product of its digits is 1128960, while the sum is 46.

The spelling of 21246675247 in words is "twenty-one billion, two hundred forty-six million, six hundred seventy-five thousand, two hundred forty-seven".