21647579848 has 16 divisors (see below), whose sum is σ = 40617054000. Its totient is φ = 10816365456.

The previous prime is 21647579843. The next prime is 21647579881. The reversal of 21647579848 is 84897574612.

It is a super-3 number, since 3×21647579848³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21647579843) 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, 915658 + ... + 939001.

It is an arithmetic number, because the mean of its divisors is an integer number (2538565875).

Almost surely, 2^21647579848 is an apocalyptic number.

It is an amenable number.

21647579848 is a deficient number, since it is larger than the sum of its proper divisors (18969474152).

21647579848 is a wasteful number, since it uses less digits than its factorization.

21647579848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856124 (or 1856120 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 61.

The spelling of 21647579848 in words is "twenty-one billion, six hundred forty-seven million, five hundred seventy-nine thousand, eight hundred forty-eight".