21707663769 has 20 divisors (see below), whose sum is σ = 35375453520. Its totient is φ = 13156159320.

The previous prime is 21707663693. The next prime is 21707663771. The reversal of 21707663769 is 96736670712.

It is not a de Polignac number, because 21707663769 - 2²³ = 21699275161 is a prime.

It is a super-3 number, since 3×21707663769³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21707663669) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12180739 + ... + 12182520.

It is an arithmetic number, because the mean of its divisors is an integer number (1768772676).

Almost surely, 2^21707663769 is an apocalyptic number.

It is an amenable number.

21707663769 is a deficient number, since it is larger than the sum of its proper divisors (13667789751).

21707663769 is a wasteful number, since it uses less digits than its factorization.

21707663769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24363282 (or 24363273 counting only the distinct ones).

The product of its (nonzero) digits is 4000752, while the sum is 54.

The spelling of 21707663769 in words is "twenty-one billion, seven hundred seven million, six hundred sixty-three thousand, seven hundred sixty-nine".