21746979705 has 48 divisors (see below), whose sum is σ = 38467558080. Its totient is φ = 10482890880.

The previous prime is 21746979697. The next prime is 21746979767. The reversal of 21746979705 is 50797964712.

It is a happy number.

It is not a de Polignac number, because 21746979705 - 2³ = 21746979697 is a prime.

It is a super-3 number, since 3×21746979705³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 279366 + ... + 348624.

It is an arithmetic number, because the mean of its divisors is an integer number (801407460).

Almost surely, 2^21746979705 is an apocalyptic number.

It is an amenable number.

21746979705 is a deficient number, since it is larger than the sum of its proper divisors (16720578375).

21746979705 is a wasteful number, since it uses less digits than its factorization.

21746979705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69462 (or 69451 counting only the distinct ones).

The product of its (nonzero) digits is 6667920, while the sum is 57.

The spelling of 21746979705 in words is "twenty-one billion, seven hundred forty-six million, nine hundred seventy-nine thousand, seven hundred five".