21470666506736 has 20 divisors (see below), whose sum is σ = 42185323631664. Its totient is φ = 10584131376000.

The previous prime is 21470666506697. The next prime is 21470666506753. The reversal of 21470666506736 is 63760566607412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9450116165 + ... + 9450118436.

Almost surely, 2^{21470666506736} is an apocalyptic number.

It is an amenable number.

21470666506736 is a deficient number, since it is larger than the sum of its proper divisors (20714657124928).

21470666506736 is a wasteful number, since it uses less digits than its factorization.

21470666506736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18900234680 (or 18900234674 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 59.

The spelling of 21470666506736 in words is "twenty-one trillion, four hundred seventy billion, six hundred sixty-six million, five hundred six thousand, seven hundred thirty-six".